What was found
AFT PIT DOOR SURROUND, FWD SHEILD HAS CORROSION. GROUNDED - YES. EVAULATED REMOVED CORROSION FROM SHEILD PER B737-900ER SRM 53-00-53-1H-2A ORIG THICKNESS IS .050 PER B737-900ER SRM 53-30-15-OI TABLE 4 REMOVED .007 REMAINING IS .043 AND FOUND TO BE OUT OF LIMITS PER B737-900ER SRM 53-00-53-1H-2.4.A.(2). REMOVED SHEILF IAW B737-900ER SRM 51-40-02. LOCATED AND DRILLED NEW SHEILD IAW BOEING DWG #146H8127 REV- INSTALLED NEW SHEILD IAW 05137-900ER SRM 51-40-02.