Solutions
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Xarishark's post in Read errors and device reset occured during parity sync. was marked as the answerAs promised updating after completion. Sync just finished with zero errors.
The weird part is on the other backplane I moved the disk with errors to another port and the errors followed the disk arround. so either the disks with two errors were just going over the power stability line because of advanced requirements (power binning???) or I have no other explanations. What do you think? @JorgeB