Mystical Peavey Delta combo Blues buzz thing.

[WholeToneMusic]

I have been working on a Peavey Delta Blues with the 2x10 combo cabinet and it seems to buzz on top of certain notes being played. I have checked all the caps and the voltages are in the ballpark with the schematic. I have gone through the amp several times with no luck, I did notice that the PCB was unsupported near the Power transformer connections and when I pushed with a chopstick the buzz had the potential of getting intermittently louder when the board flexed.I cut the molex connectors and hard wired the PT leads onto the board for a stronger connection. I staggered the adjacent wiring to keep it more isolated, and then double checked the connections with the schematic. Would there be parastic oscillation from the parallel traces on the board when flexed? I have heard longer grid runs can cause the parasitic oscillation. I have tried changing out the preamp and power amp tubes with no luck. I noticed the metal tube protector panel was loose so I tightened it up. I re-tensioned the tube sockets. I checked all the wire jumpers on the board. I am at a loss here. Any suggestions would be much appreciated.

Also when shutting it off the amp pops, which wasn't noticeable before, The pop seems louder when the boost is engaged, This is a typical issue with the non-standby amps, Is there anything to do to minimize it with a suppression cap?