As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C4 S1 C-CHECK, INSPECTION REPORTED CORROSION WAS FOUND ON DUMMY RAIL Y503.2 AT FRAME 16. MAINTENANCE REMOVED AND REPLACED DUMMY RAIL IN ACCORDANCE WITH THE REQUIREMENTS OF SRM 51-42-11. UPON COMPLETION OF THE INSTALLATION THE NEW RAIL WAS INSPECTED AND FOUND ACCEPTABLE.