I'd love to see more details on the defective parts, particularly counts of CPU model (anonymized if needs be) and counts of which part of the architecture exhibited faults.

From working in HPC I've handled reports of things like FMA units producing incorrect results or random appearance of NaNs. Were it not for the fact that we knew these things could happen and customer's intimate knowledge of their codes I dread to think how'd "normal" operations would track these issues down. Bad parts went back to the CPU manufacturer and further testing typically confirmed the fault. But that end of the process was pretty much a black box to anyone but the CPU manufacturer. I'd be keen to know more about this too.