As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE WORKING ON FR81 INNER AND OUTER SURFACES DAMAGE ON CC# 00187, FOUND FR80 WITH CORROSION BETWEEN LBL 7 AND RBL7. REMOVED AND REPLACED FRAMES AT FR 80 L/H AND R/H SIDE OF BELLY PER A220 ASRP BD500-A-J51-42-20-00AAA-078A-A AND BOMBARDIER DWG C01401201 REV R. (LP# 1631269; AIRCRAFT WAS GROUNDED)