As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*** WHILE AIRCRAFT WAS OUT OF SERVICE FOR HEAVY CHECK *** "MAJOR" LEVEL 2 CORROSION WAS FOUND AT LOWER FUSELAGE AFT WASTE TUBE ACCESS PANEL CUT OUT AROUND HINGE AREA. REPAIRS DONE IAW SRM 53-23-01, 53-23-60 AND 51-23-06. AIRCRAFT REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.