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Tried ASD version 2.5.7 with the same results, it doesn't detect CPU1 Exhaust Fan as a component to test and get the same results trying to run the tests.

Thanks again, further digging and I can see that Apple Service Diagnostic no longer detects the CPU1 Exhaust fan as if it isn't there to test, the other 6 fans are showing. Running any tests involving the memory now also cause the machine to unexpectedly shutdown so I'm thinking unfortunately...

I did think that however running the hardware tests on the ASD 2.5.8 CD for the sensors and they all pass. I replaced the rear exhaust fan assembly as well to rule that out and get the same behaviour with the new fans.

My Dual 2.0GHz PowerMac G5 had one of the CPU's go faulty around a year ago, I thought it was the end of the line however managed by luck to pick up a matching pair of G5 CPU's for it, the serial numbers of the new CPU's were also from the same batch as the ones that originally were in the...

I've seen mixed reviews with the ASD 2.5.7 restore, ASD 2.5.8 was released which seems to be a little better at running Thermal Calibration. You can download a copy of the ASD 2.5.8 software and burn that to CD by going to https://www.macintoshrepository.org/42546-apple-service-diagnostic-2-5-8