A follow up. As Ken has predicted, my cleansing with just a cut piece of print paper only workd briefly, and the left channel sound whobble/fading came back again. I had to order a set of sand papers online, which cost me no more than a US dollar though. Opened the chasis again of SA20, used a slice of sandpaper respectively cut off from 3 different refining level/grits, hone the contacts a dozen times for each paper. And put the amp cap back again. Now the sound came so solid to my ears, no evasive fading at all, at least for now. I believe this time it should last much longer, if not for years? Hopefully.
I know you love working on your Arcam! I mean who doesn’t? 
But just incase it happens again, and it did to a brand new relay, use a touch of Deoxit D-5 on the points next time. It works miracles to restore volume controls, switches and relay points and prevent further oxidation. I have been using it for 20 plus years.
Ken
Will definitely try would it happen again! Thanks Ken.
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Occasionally my right hand channel will crackle and the volume will be low. It is resolved by putting the device into standby and back on or fully turning off using the power switch and back on again.
It is suggested this relay may be my issue. I’m not tech savvy but if it’s something easy to do I would have a go at cleaning the relay as I have some deoxit .
Looking at the photos in this thread it looks like I need to disconnect the internal speaker connections inside the unit and I can then get to the relay.
Is it easy to remove the relay cover and is it easy to spray the contacts. Are there any particular risks I need to be aware of. I don’t want to totally damage the unit. If it’s too difficult or there are risks then I’d rather send it off for repair.
Thanks