Well I now have a supspect component.. part number LT334D (3 pin transistor
casing), which I'm guessing is a rectifier.. it's attached to a heatsink and
all 3 pins measure as a dead short.. I must need a bigger iron to remove
it though, as my 25W pencil iron won't do it.. (the heatsink absorbs all the
heat when I try to unsolder it)..

I'm guessing the heatsink is live too, because there's no washer between the
part and the heatsink..

If I could get it out I could test it better.. any suggestions are welcome..

Chris