So - I pulled the amp out, took photos and sent them to Andrew (all looked fine), shook out some crap (bits of what looked like thin bits of solder), jiggled all the cables, swapped my input/output cables when putting it back..... and so far it has been perfect. Only been playing the radio so far and not drop outs. Next test is Aussie devil-worship music (ABBA) so cross fingers it is all good!

HT:M80,VP150,QS8,EP500 Outside:4xM3 Office:AudioBytes, Rumpus: M60,VP150,M22 Portable:2 x Airs