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If you can figure out what you wife wants for dinner at least once a week, you can work on an MEP.
The DC voltage should be the same across the system, so you have already started to diagnose the issue!
Study the wiring diagram (both on the door, and in the TM if need be, as it has info about...
Start with the batteries, if you are only measuring 21V, I am surprised its even starting up. From the -24
22. GENERATOR SET FAILS TO GENERATE POWER.
Step 1. Test for defective ac circuit interrupter relay (K1), paragraph 2-61.3.
a. If AC circuit interrupter is not defective, do Step 2.
b. If...
I would look the cabinet over to see if there is any visible water retreat line, or rusted fasteners (or anything to indicate it might have been in a flood area). And look over any visible wire contacts for any powder corrosion showing the presence of water.
I would only be suspect in the cost...