What was found
MULTIPLE SPOTS OF CORROSION ON THE SHIELD ON THE RIGHT HAND SIDE OF THE AFT CARGO PIT BETWEEN STATIONS 767 AND 787,18 INCHES FROM THE BUTT LINE. GROUNDED - YES. REMOVED CORROSION FROM THE AFT PIT, FWD SHIELD FROM STA 767 TO 787 IAW B737-800 SRM 53-60-15-1A-1.2.A ORIG THICKNESS IS .050" IAW B737-800 SRM 53-60-15-01-1 TABLE 4 REMOVED .010" REMAINING THICKNESS IS .040" AND IS FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-60-15-1A-1.4-G.(2) REMOVED & REPLACED THE AFT PIT, FWD SHIELD IAW B737-800 SRM 51-40-05 AND SRM 51-40-02.