Looking t the connector from the front of the sled, the pins I probed were C, s and G for constant, switched and ground respectively. Capital letters for the 2 bigger contacts on the plug. '.' are the other small contacts.
...........C
..........sG
I think the only other pin that could affect anything here is the one directly above the "s" pin: "amp remote". One possibility here is that the power amp is shorting out something when enabled --> the "amp remote" line (+12V from the empeg to the amp) enables it.
EDIT:
Best way to test this, is to disconnect power from the amp. Otherwise, perhaps just cut the blue "amp remote" wire and see what happens with that, and then solder/tape it back together again later on.
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