Sony TA-N1 2-Channel Amplifier "spray selector button" Questions

...selector button(CD, Tuner,AUX, Data etc) jumps like crazy from one selection to another and I have to turn it of. It does it randomly and sometimes stops, sometimes won't work for days.I can't found ...

...selector switching, and may even have more than one switch or control causing the problem. Start with the source/direct button. To resolve this, best bet is to "flood" the internals of the switch or ...

...selector switch that is the problem? If so, where can I get a replacement switch? Thanks. Yes Yamaha haven't made good contact switch yet, I don't know when, I've seen lot's of yamaha with bad switch ...

selector switch a bit to add some contact spray.However, this time the culprit wasn't the selector switch, but the switch inside the headphone socket. Spray with dedicated contact spray (not WD40)