As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A HEAVY MAINTENANCE CHECK, THE AFT ELEVATOR SUPPORT AND FLOORBEAM IN THE MAIN CABIN AT STATION 870 RBL 25 WAS FOUND CORRODED. REMOVED FLOORBOARD SUPPORT IAW DC10 SRM 513501 VOL 2. FABRICATED SUPPORT IAW DAC DC10 DWG ADA7605. ALODINED AND PRIMED IAW DC10 SRM 512101 VOL 2. INSTALLED SUPPORT IAW DC10 SRM 513501 VOL 3.