these are not sensitive to neither pcb nor heads, so it should not click like that. But clicking after pcb swap clearly points towards preamp damage. and with a damaged preamp anything could happen, this is why i always advised checking preamp after a suspected OV, without trying to power the drive with a replacement pcb.
There's one thing worth noting, namely that there are 2 types of pcbs these drives came with: OA90377 and OA90381, the main difference being the motor controller. However, i still don't think this is the issue, as the drive cloned just fine with H0.

another possibility is that the overvoltage did not kill the preamp, but only triggered uncontrolled write current on channel 1, damaging the content on that surface. This could be checked by putting the orig head stack back and disabling H1. I would also check the patient MHA in a donor, where it cannot do significant harm (disabling one head at a time).