The Mk2 has only a single power fuse, on the +12V input. His player appears to have a break between the GND input and the empeg mainboard ground. So the fuse doesn't enter into it.

And from the measurements given, it pretty much has to be in (or very near to) the DC power jack itself.

Time to dig out a magnifying glass, and look VERY VERY closely at the pads around number 1. Maybe look at the backside of the board too. Is the DC jack *really* connected to an unbroken/unlifted pad on the mainboard ?

Cheers