Thanks for the advice Ty. My three year old SSE started blowing fuses on start up yesterday. I failed to get continuity across the diodes either way. I cut them out and on restart had a sparky GZ34 and more blown fuses. Replaced the GZ34 (lucky I had one) and fuses and now all is well. Only thing I can deduct was it had been running fine the day before (oh yeah, its still on the test board I built it on) and the PCB had a fair amount of dust on it as it lives in my basement. Weird as I have recently been thinking of a chassis for it. I think its time and I'll get to it one day. Thanks for the advice.