Rivera Jake Studio Combo 55 watt amp

[punkykatt]

http://el34world.com/charts/Schematics/files/rivera/rivera_r_series.pdf
Hey Guys, got is amp in for snap, crackle, pop complaint.  Did a clean & service, pots, jacks, switches, tube sockets, grounds, retention tube pin grippers,  reheated and added solder to PCB tube socket pins, installed all known good preamp and power tubes. Amp still making noise for a few minuets and then works flawlessly.  Shut it down, let it cool, turn it on and snap crackle pop is back.   I put my listening tool on the amp and traced the  noise source to V1  47k 2w (R103) plate load resistor.  I replaced R103  and inspected all other solder joints while I had the PCB out. All solder joints look healthy.  Go to fire up the amp and it still snap crackle pop for a few minutes then quiets down nicely.  I checked (C101) 10uf/450v with my ESR meter and is reading where it should be.  Then I clipped in a  new 10uf/450v cap across C101 and it did not help.  V1 tube socket looks like new. Did I miss anything?   Bad PCB maybe?  Any input is much appreciated.   Punky