What was found
DURING CPCP INSPECTION FOUND LEVEL 2 CORROSION, BETWEEN BS 520 AND BS 600, AT RBL 50, THIRD RT SEAT TRACK CORRODED. REMOVED SEAT TRACK, FOUND TO BE OUT OF LIMITS IAW B747 SRM 51-30-02 AND SRM 53-10-01. REPLACED SEAT TRACK IAW SRM 51-10-01 AND 51-30-02. CORROSION TASK CARD NUMBER C53-210-01 PART 2 OF 8. NON-ROUTINE TASK CARD NUMBER 12903.