Hi guys, i earlier posted issues with popping sound when using switches while using phono. I read through the post form premiumplus that seemed to have the same issue. In reading some of the responses i noted that dirty switches were the possible fault. Since then i cleaned all switches again using Detoxit, standing the unit on its back, face off and connecting nuts removed i sprayed the red into all openings, i worked all switches about 40 times each, then let the unit sit for a few hours. After which i sprayed detox with lube and reworked switches. I left the unit over night and reassembled the next morning. No change but i get a bit of a hum from speakers at 45% plus volume increasing with volume, this was there before but i notice the hum doubles if i connect an outside ground to the chasis, i was wondering if the two problems are connected.Lastly i notice when using the unit the right side gets warmer than the left.