As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATOR CASE BOLTS WORKED LOOSE, SAFETY WIRE BROKEN. CATASTROPHIC FAILURE AT 152 HRS SINCE O/H. THE ORIGINAL MFG HISTORICALLY LAST MUCH LONGER. ADVISE SELF LOCKING BOLTS AND LOCK TABS AS THE ORIGINAL, AND EXTREME CLEANING OF MATING SURFACES PRIOR TO ASSY.