What was found
PASSENGER CABIN, FLOOR INTERCOSTAL AT STA 947.5+2'; LBL 25; WL 208 IS CORRODED ON UPPER SURFACE. REMOVED CORROSION FROM PASSENGER CABIN FLOOR INTERCOSTAL STA 947.5 + 2' LBL 25 WL 208. VERIFIED USING 10X MAG GLASS, IAW SRM 53-70-51-1A-1. EVALUATED INTERCOSTAL AS MATERIAL LOSS OF 0.084', ORIGINAL THICKNESS OF .205' MAX ALLOWABLE LOSS OF .0205 INTERCOSTAL IS OUT OF LIMITS, IAW SRM 53-70-51-1A-1. REPLACED INTERCOSTAL PN 147A5660 ATAG WN1337, IAW BOEING DWG 147A5650 REV A & SRM 51-40-02-0G-0.