What was found
FWD PIT STA 492; RBL20; WL186; LONGITUDINAL FLOOR SUPPORT CORROSION. REMOVED CORROSION FROM FORWARD CARGO FLOOR TRACK AT STA 492; RBL 20 AND VERIFIED CORROSION REMOVED WITH 10X MAG. IAW SRM 51-10-02. MEASURED MATERIAL LOSS. ORIGINAL MATERIAL THICKNESS .063 LOSS OF .029 WITH .034 REMAINING IS OUT OF LIMITS IAW SRM 53-00-53-1A-2. REMOVED RBL 20 TIE DOWN TRACK IAW SRM 51-40-02. FWD PIT LONGITUDINAL FLOOR SUPPORT FOR STATION 400-500D PART# 143A7501-10 A IAW B737 IPC 53-42-11-04. VERIFIED FLOOR SUPPORT PART EFFECTIVITY STEP 4 C/W. LOCATED AND DRILLED NEW FLOOR SUPPORT IAW SRM 51-40-05-0G-0 AND DWG 143A7500 ID 0001 REV-. INSTALLED NEW TIE DOWN TRACK IAW SRM 51-40-02-0G-0; DWG 143A7500 REV -.