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I didn’t realize when I posted earlier that the terminal voltages are marked on the schematic for the AMT-3000 so you can get them there.
Mine measured very close to the schematic values except for Q1 C etc which is 1.97 V.
Anyway, here are my unit’s voltages (DC to circuit ground)
Q5 15.0 2.57 1.97
Q4 15.0 2.57 1.97
Q3 15.0 1.83 1.16
Q2 1.97 1.16 0.42
Q1 1.97 13.7 14.4
Your measurements should be fairly close to these. Be careful when taking the readings that you don’t short anything with your probes. If your readings are way off that may lead to finding the problem.