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I completely desoldered the resistor module, and resoldered all of the pads on the ceramic module, both sides - and stuck it back in and resoldered it. Still not working. I'm wondering if perhaps one of the printed resistors are actually damaged or open.
I also pulled the 9-89 as well. Definitely a lot of lousy looking solder joints, but none actually broken. I resoldered that board as well. It did not fix this problem, but it probably would have caused it's own issues at some point down the line.
If you can find the schematic for the 9-88-03, that would be a huge help, so I can check the elements of that resistor module. I'm still suspicious of that part, and I sure hope what's in there is documented.
Thanks!
-Ian
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