What was found
AFT RIB ON UPPER COWL PANEL 424AL IS CRACKED. REMOVED CRACKED STIFFENER ON AFT RIB, UPPER COWLING REF DWG 85414014 & SRM 54-45-10. INSTALLED STIFFENER ON AFT RIB, UPPER COWLING PN 85414014-101 IAW SRM 54-45-10. NO DEFECTS NOTED. RECEIVED NEW STIFFENER PO TX836, PN 85414249-101 IAW DWG 85414014 & RIVETS COMMON TO PART. LOCATED & DRILLED HOLES ON STIFFENER, PN 85414249-101 IAW SRM 51-40-07. PREPPED & PRIMED SURFACE TO AFT RIB SECTION OF UPPER COWL PANEL 424AL AS REQUIRED IAW SRM 51-25-10. RESTORED FINISH TO RIVETED AREA OF PANEL 424AL REF SRM 51-25-05.