I just finished reseating my ribbon cables and all of the contacts work.  Even A1 - 12 through to K1-12. 

Well, I haven't turned it off yet.  When I do so, I turn it on and poof...

I'll get G and B at once, when under B it'll skip to H  and then move on to I when I push the next number.

|I have finished reading 5,000 posts on vintagebbs about the Chroma and realize I may be slightly screwed here.  Revision 5.  No o-scope.  No tech repair guys within serious mileage.  May need to re-calibrate this sucker.  Found the 3 power supply trim pots as well as the other 2 on the mommy board.

Cleaned all of the junk off the traces and did a full inspection but am no repair tech.   Replaced the face plate by Paul and it seems to work fine.   It's something else that is definitely whacky.  Been inside this beast more times than I wanted to be.  I'm going to leave it on all night to see if it burns out or "burns in" like we say in the PC world.

When I did the diagnostics and adjustments, I had to constantly turn it off because it hung on a whim.  At least I know all the LEDs work!  I was trying to get a set of patches in but the tape process was a bust and my Midi connection sux at the moment.  I have Sound Quest 11 but can't get the Polaris to talk.  I may have found that answer out but won't know until the other issues are addressed.