diff --git a/signoff/caravel_fix b/signoff/caravel_fix
index e69de29..84015e5 100644
--- a/signoff/caravel_fix
+++ b/signoff/caravel_fix
@@ -0,0 +1 @@
+7e00c74a91f44ab4b6e7765e5f673bfad64673bd  ./gds/caravel_00010003_b.gds
diff --git a/signoff/run_metal_fix.out b/signoff/run_metal_fix.out
index 9c6a4c6..3363a4b 100644
--- a/signoff/run_metal_fix.out
+++ b/signoff/run_metal_fix.out
@@ -2,14 +2,64 @@
 User prefix is 66_
 Replacing cell caravel in the user GDS file.
 Reading GDS file for alternate cell caravel
-Traceback (most recent call last):
-  File "/usr/share/pdk/bin/change_gds_cell.py", line 74, in <module>
-    with open(cellsource, 'rb') as ifile:
-FileNotFoundError: [Errno 2] No such file or directory: '/mnt/share/open_mpw/caravel_fix/gds/caravel-mpw-one-final-metal-fix2.gds'
+Cell caravel found at position 235669746
+Cell caravel ends at position 247680056
+Reading GDS file for original source ./gds/caravel_00010003.gds
+Cell caravel found at position 2964238396
+Cell caravel ends at position 2976248248
+Cell caravel checksum is 12009824
+Info:  Structure caravel matches checksum 12009824
+Info:  Structure caravel at 2964238396 to 2976248248 will be replaced by alternate data.
 Prefixing caravel subcells in the user GDS
 Running:  /usr/share/pdk/bin/change_gds_string.py user_id_textblock 66_user_id_textblock copyright_block 66_copyright_block open_source 66_open_source storage 66_storage sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped 66_sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped user_id_programming 66_user_id_programming simple_por 66_simple_por gpio_control_block 66_gpio_control_block mgmt_core 66_mgmt_core mgmt_protect 66_mgmt_protect chip_io 66_chip_io user_project_wrapper 66_user_project_wrapper ./gds/caravel_00010003_b.gds -debug -verbatim
-Traceback (most recent call last):
-  File "/usr/share/pdk/bin/change_gds_string.py", line 72, in <module>
-    with open(source, 'rb') as ifile:
-FileNotFoundError: [Errno 2] No such file or directory: './gds/caravel_00010003_b.gds'
+Original data length = 2976248970
+Replaced b'open_source\x00' with b'66_open_source'
+Replaced b'user_id_textblock\x00' with b'66_user_id_textblock'
+Replaced b'copyright_block\x00' with b'66_copyright_block'
+Replaced b'storage\x00' with b'66_storage'
+Replaced b'sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped' with b'66_sky130_fd_sc_hvl__lsbufhv2lv_1_wrapped\x00'
+Replaced b'user_id_programming\x00' with b'66_user_id_programming'
+Replaced b'simple_por' with b'66_simple_por\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'mgmt_core\x00' with b'66_mgmt_core'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'mgmt_protect' with b'66_mgmt_protect\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'gpio_control_block' with b'66_gpio_control_block\x00'
+Replaced b'chip_io\x00' with b'66_chip_io'
+Replaced b'user_project_wrapper' with b'66_user_project_wrapper\x00'
 Finished.