Alphaserver 1000 diagnosis?

I have three Alphaserver 1000A machines all of which have problems. The bcache failed on all the CPUs - there is a jumper on the CPU card to disable it and run with reduced performance (one of the SRM memory diagnostics then fails spectacularly as it divides something by the size of the cache...) On of the CPUs failed entirely. One of the machines used to randomly halt and progressed to randomly powering itself off, possibly due to it thinking a fan is faulty when it is not. On the rare occasions when I've had one working, I found that the correct positioning of the CPU in it's slot can be very critical. I've also had problems with memory failure and found (by doing lots of swapping) that the SRM can report the wrong memory slot as being the one with the problem. The power supply sits there getting hot and consuming lots of power when the front panel power switch is off making it necessary to disconnect it from the mains when not in use. I've had so much grief with mine I've lost interest in trying to fix them. Opinions of the 1000A do not seem to be very high. I think the main difference between it and the 1000 is that the 1000 has more (E)ISA slots and the 1000A has more PCI slots. I don't know if they suffer from similar reliability problems.