I feel like this might be an error code, but I don't remember Bally machines doing this outside of diagnostics. Game plays fine, but it doesn't go through entire diagnostic menu before locking up.

Thoughts? Thank you!

Brilliant! You called it:

centaur / version 27 221008

freeplay:
if dip switch 25 = on and dip switch 26 = on freeplay is enable: decrease credits not lower then 01
coin 3 works now same as coin 2, dip 17 - 20 has new meaning
dip17 = off, flashing 50k and getting 50k for hitting orbs in sequence
dip18 = on , erase bonus after one ball total
dip19 = off, don't give power orb during multiball
if orb targets are out of sequence laught (but only if O was the first target you drop)
Dual target hits for ORBS target enabled (we wait two flashes until we detect an out of sequence error...)... change speech:
When (no multiball is running) or (multiball is running an dip 19 = on) and all ORBS dropped in sequence we say:
"Sequence completed activate Power Orb"
otherwise if all orbs are not dropped in sequence we say "energize power orb"
If multiball is running and all ORBS are droppend in sequence (with dip19 = off) we say "Sequence completed activate Power Orb"
if Multiball is running and all orbs are dropped not in sequence (withdip19 = off) we say "completed"
Installation notes:
read the file readxxx.txt file
create (based on your orignal roms) customs roms

Burn the two files on 2732 eprom
After power on you will see the version number in the player one display.