Running tests on refurb'd CA-2010, ran as separate/power amp. When completed reverted switch and left channel was gone. Resistance measurement at coupler showed left was open and right channel was 14ohms, not ideal but... Gave it the magic spray but it wasn't much better. Decided to strip it down and give it a clean. Before and after picks below. No drama. Then thought that I'd better clean the DC/NORMAL switch, it was in same condition. However during reassembly I bent one of the copper sliders. So I spend the next hour trying to recover the slider, it's OK but was thinking what a waste of time. Did a quick search on Mouser, ALPS switches sell for about $3-$4, for this you get a nice new/clean switch, no problems for years. The alternative is to strip the switch down. My question, does anyone know of a drop in replacement from mouser etc... Same issue on CA-800, 1000, 1010.