Sorry not got any 542's at the moment, I never keep dead ones anyway, just bin them.
If I'd have know people want them to play with them I'd save them but to be honest it's very rare they go wrong.
I know I have a couple of dead 880's kicking about but these will be well fried.
Customer lives right next door to a main sub station and every couple of years everyone down his road get all the electrics fried but they claim it off the lecky board.