As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING DISASSEMBLY OF DRIVE SHAFT, 3 OF 12 SCREWS FOUND WERE THE WRONG TYPE. THERE WAS NO SPLIT PIN HOLE, AND THEY HAD BEEN INSTALLED WITH A HEXAGONAL, INTERNAL LOCK NUT. THE ENDS HAD BEEN CENTER PUNCHED TO PEEN ENDS OVER. SCREWS SHOULD BE CASTELATED WITH SPLIT PIN.