Here's a thought.
The CIT-100 is essentially a shameless knockoff of the VT100, right down to being able to interchange keyboards, AFAIK. There's plenty of good maintenance info on the DEC product; perhaps it would be a help?
We used several of the CIT 220 terminals back in the day--I really liked them.
Yessir! I did dump the EPROMs. The contents look good. There are ASCII strings in the
first three, the forth one has nothing readable, I hope that's because its all code. Hard to know.
Let me know where you would like them sent.