What was found
UPON REMOVAL OF LAV SERVICE PAN FOUND CORROSION ON SKIN AROUND CUTOUT. PER B737 SRM 53-60-01-0I-1 FIGURE 9 SHEET 4 ORIGIONAL SKIN THICKNESS IS .080". REMOVED CORROSION AND FOUND OUT OF LIMITS. REF SRM 53-00-01-1A-5, APPLIED GRID TO DAMAGED AREA. DRILLED HOLES IN LAV PAN INSIDE STRUCTURE IAW SRM 51-40-02. PERFORMED UT THICKNESS MEASUREMENTS FOR REMAINING MATERIAL (FOR GRID) IAW NTM PART 4 00-04-02. STEPS 1-4(D) OF AVO: 18410. REMOVED EXISTING FASTENERS IN CUTOUT AREA, PERFORMED DVI OF THE SKIN AT REPORTED DAMAGED AREA PER AVO 18410 STEP A(4)(E). VERIFIED CORROSION REMOVAL. ACCOMPLISHED STEP 5 (A-C). ACCOMPLISHED STEP 5 (A-C). STEP 5 (D) REQ HFEC INSPECT EDGES OF TRIM OUT IAW NDT MANUAL PART 6, 51-00-00,PROCEDURE 23. PERFORMED HFEC INSPECTION OF TRIM OUT NDT MANUAL PART 6, 51-00-00, PROCEDURE 23, NO DEFECTS NOTED. REPAIR COMPLETED, ITITATED (2) DIPS REF L/P 3638591, 3638548. REF FINAL ECRA 5300-03399.