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My QRX-7001 pops in the speakers when the Tape Monitor or Auxiliary buttons are pushed. About 9 mon. ago I cleaned all switches and pots with contact cleaner followed with Caig's Deoxit 5 - the Tape Mon. and Aux. did not respond. I checked the board for continuity with a VOM and all checked OK. So, I re-cleaned the Tape Mon. and Aux. and applied Deoxit (this is a hard area to reach). The popping went away. Recently, the popping returned. Any ideas on what to check, magic bullets, etc.? Thanks for any help.