I am pretty sure that is they were swapped then the RAID array would have been corrupt and not bootable. If they were swapped the damage is done and there will be no way that I know of to repair the array. Been there done that several years ago on an Abit KT7 RAID board and I lost the array.
Found a couple of people that did accidently swap cables and it was unbootable even after swapping them back. So I think the access error is unrelated unless there is some difference between you controller and theirs which was an SiL and you have a Nvidia.
Found a couple of people that did accidently swap cables and it was unbootable even after swapping them back. So I think the access error is unrelated unless there is some difference between you controller and theirs which was an SiL and you have a Nvidia.