The keyboard on my Franklin ACE 1000 suddenly started having dead keys. Working through the troubleshooting checklist in the SAMS guide, it became clear that the special capacitative-keyswitch IC had fried.
As a replacement IC doesn't appear to be available, I designed a replacement in KiCAD that uses CherryMX keyswitches and osiweb's Unified Retro Keyboard ASCII interface. I've yet to source proper replacement keycaps, so I'm using a random set I found on Taobao, but it is otherwise working well.
The KiCAD files are at https://github.com/ryucats/Franklin-ACE-1000-Keyboard and the relevant keymap code has been submitted to osiweb via https://github.com/osiweb/unified_retro_keyboard/pull/42
I have three spare boards if anyone needs one. Price negotiable.
Obligatory construction pictures follow: