What was found
DURING ROUTINE CPCP INSPECTION FOUND LEVEL 2 CORROSION, IN MAIN CABIN ON FLOOR SUPPORT BETWEEN BS 820 THROUGH BS 860, RBL 10 IS CORRODED. REMOVED CORROSION, FOUND OUT OF LIMITS IAW B747 SRM 51-10-06. ID MATERIAL PN BAC1520-1566 IAW B747 SRM 53-10-21. REPAIRED SEAT TRACK IAW B747 SRM 53-10-21. CORROSION TASK CARD NUMBER C53-210-03-4. NON-ROUTINE TASK CARD NUMBER B0083-16-N-00445.