What was found
APU INLET HAS AREA OF CORROSION ON LOWER FLANGE. REMOVED CORROSION, PERFORM UTI, FOUND FLANGE OUT OF LIMITS, FABRICATED NEW FLANGE, TREATED, PRIMED AND INSTALLED IAW SRM 51-10-2 & 51-40-02, NDT MANUAL 51-00-10 AND DWG 353T0115, ACFT WAS GROUNDED.