This amp has had a dodgy mode selector switch almost from the time I bought it new. (viewed from the front, it's the first control on the left side) The sound output will be fine for some time, but will suddenly become patchy and fragmented. Rotating the switch through it's full range several times always fixes it. We only ever use the CD and AV positions of the switch. I'm no electronics boffin, but from the symptoms it sounded to me like the result of a dirty rotary multi-pole switch, so finally, after umpteen years of putting up with it, I thought I'd see if I could do something about it. However, after opening up the unit, the switch is obviously somewhat more sophisticated than a simple rotary type, and I'm not sure how to proceed further. The switch consists of a small oblong box, about 25mm x 35mm square and about 55mm in length. The aluminium case is marked 'ALPS' and 'Japan' and also has a small circular appendage about 20mm in diameter, fixed to one side near the front. The whole unit appears to be soldered into the motherboard at several points, so it doesn't look as though I can easily remove it for cleaning, given my level of inexpertise. Can someone suggest a fix for the problem? As I can't remove it, I wondered if it might be productive if I was to turn the whole amp upside down and spray some CRC inside the switch casing. Otherwise I can't see what else I can easily do, short of simply putting up with this intermittent problem, or replacing the amp. I did email Arcam about the problem a couple of years back, but had no response at all. Advice would be much appreciated. PS. There seem to be several nylon cogs inside the switch case, though they don't rotate when the switch axle is turned. However, the switch seems to work OK, as it selects between modes without problem - it's simply that occasionally, after sitting in one position for several hours, some component of the switch ceases to properly conduct a signal until it's moved several times. Thanks.