I have a Pioneer SX-820 that has developed issues while on FM: low volume (about 10% of what it should be), one channel has less volume than the other and loudness switch does not work. Both The FM Stereo/mono switch and loudness switch have been cleaned thoroughly. On all other modes such as AUX, Phono and AM Radio there is no issue. Any suggestions where to look for the problem. Any technicians out there?
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