Zapco z-150.2 LX

I have 40v of rail voltage on all the out puts
 

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Do you have DC on either of the bridging speaker terminals?

If not and you connect speakers to the two channels, does either channel ever produce a pop or loud click?

If it will power up, does pushing/pulling/twisting thee various components change anything?

Does heating/cooling (inverted canned air) change anything?

Why aren't you switching remote?