The one with the damaged P-list wasn't so easy. Had a lot of damaged SA modules, and at first couldn't even read the P-list module through composite reading. Eventually with enough tries, I was able to get enough of the module that the only unread part was near the end where it's all zeros. It surprised me when the checksum actually passed. I had only given the customer 50/50 odds, because I wasn't sure I could get a working P-list or not.