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, LEVEL 2 CORROSION WAS FOUND AT L2 AFT PASSENGER FLOORBEAM. BEAM WAS REMOVED AND A NEW BEAM WAS INSTALLED IAW SRM 51-42-03 AND 51-43-04. AIRCRAFT REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.