What was found
PAX CREW DOOR LOWER FWD PAN IS CORRODED OUTSIDE SRM LIMITS APPROXIMATELY 3 INCHES FWD OF BOTTOM SPLICE AT INNER SKIN. (LEVEL II) REMOVED INTERCOSTAL IAW ATR 72 SRM 51-25-01 REV 77. REMOVED CORROSION FROM INTERCOSTAL IAW ATR 72 SRM 51-21-42 REV 77 AND ATR 72 SRM 51-21-58 REV 77. FOUND INTERCOSTAL TO BE OUT OF LIMITS IAW ATR 72 SRM 52-11-00 FIG 301 ITEM 3(C) REV 77. UPON REMOVAL OF INTERCOSTAL FOUND CORROSION ON INNER SURFACE OF EXTERNAL SKIN. REMOVED CORROSION IAW ATR 72 SRM 51-21-42 REV 77 AND ATR 72 SRM 51-21-58 REV 77. RECEIVED NEW INTERCOSTAL P/N S5217620720201 AND MATCH DRILLED IT TO EXISTING STRUCTURE. INSTALLED NEW INTERCOSTAL IAW ATR 72 SRM 51-25-01 REV 77 AND ATR 72 SRM 51-25-04 REV 77.