Wad 2a3 pse hum problem

[Paulrr]

I have had a WAD 2A3 PSE amplifier for a number of years, and had a problem with motor boating on one channe so I swapped out the capacitors between each stage and that disappeared only to have motor boating on both channels. Looked at the DC levels with a simple multimeter and swapped out all of the the main Power supply 100uF 450V capacitors, one of the new ones blew, fuse too, both replaced, but still have more hum than normal, have tried adjusting the 2A3 pots, still residual hum, I assume I still have a power supply problem, any ideas, still a capacitor I think, any advice greatly appreciated.

Fab amp otherwise.

Paul