As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRUCTURE JUST FORWARD OF RT AFT SERVICE DOOR FLOOR PANEL 242MRF CORRODED AT FR74 OTBD OF RBL 43.5 WL151.5. R & R STRUCTURE (STRAP) FWD OF R/H AFT SERVICE DOOR AT FR 74 OB OF RBL 43.5 WL 151.5 PER A220 ASRP BD500-A-J51- 42-06-00AAA-078A-A AND BOMBARDIER DWG C01342700 REV:-T. (LP# 1579074; AIRCRAFT WAS GROUNDED)