As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND REPAIR PATCH CORRODED ON AFT PRESSURE BLKHD BETWEEN STRINGERS 35 AND 37 FS APPROX 1824. FOUND TO BE OUT OF LIMITS IAW SRM 51-21-01. REMOVED AND REPLACED REPAIR PATCH IAW L1011 SRM 53-11-00 FIG 805. FOUND DURING SCHEDULED C-CHECK AND CPCP WORK CARD ACCOMPLISHMENT AT AIA. MAINTENANCE FACILITY IN OSCODA, MI. WORK ORDER NR 106-187, NON ROUTINE CARD NR 32493, CPCP TASK NR C53-120-04-03.