I have been using my SX-850 as my garage receiver and I noticed that the phono stage has lost a channel but comes back if I flip to MONO. All the other inputs are fine in STEREO but both PHONO1 and PHONO2 will only play both channels in MONO. Sounds fine although every now and then I hear a snip or tiny tick like I'm playing a dirty record. I cleaned the switch several times already with deoxit to no avail. So now I'm not using the PHONO stage since I'm convinced it's in need of a recap. What should I be looking at? Any insight would be greatly appreciated. Thanks.