What was found
EVALUATED EXHAUST PORTS AND FOUND EXFOLIATION CORROSION ON THE FWD PORT. APPLIED EWIS PROTECTION ON INTERIOR SURFACE AT LOCATION OF FWD LAV IAW AMM 20-60-07. CLEANED EXTERNAL SKIN SURFACE OF FWD LAV VENT & FOUND NO EVIDENCE OF CORROSSION. REMOVED CORROSION ON INTERNAL SKIN AT FWD LAV VENT. PERFORMED ULTRASONIC THICKNESS CHECK OF BLENDED AREA OF FWD LAV WASTE VENT, LOWEST REMAINING THICKNESS 0.077" IAW NDT PT 4. 51-00-10, PROC 2, REWORKED AREAS GREATER THAN 15% OF SKIN THICKNESS & OUT OF LIMITS IAW SRM 53-00-01-1A. IAW SRM 53-70-01-2R-1, REPAIR PARA 4, COMPLIED WITH STEPS A & B. PERFORMED SKIN CUT OUT OF CORROSION DAMAGE IAW STEP C OF SRM 53-70-01-2R-1, PUT SKIN BACK TO ORIG CONTOUR IAW STEP D. PERFORMED HFEC EDGE INSP AS REQUIRED IAW SRM 53-70-01-2R-1, STEP 4. E, & NDT PT 6-51-00-01, PR2 WITH NO RELEVANT INDICATION. COMPLETED SET 4F DETAILED VISUAL INSP NO FURTHER DAMAGE NOTED.