What was found
MCN - MAJOR REPAIR - "C" - DURING C-17 CHECK MAINTENANCE DISCOVERD A HOLE DRILLED THROUGH INBOARD L/H MIDFLAP LOWER SURFACE INTO THE FLAP TRACK SUPPORT RIB AT APPROXIMATELY WBL 116. DAMAGE APPEARED TO BE FROM A DRILLED OUT GREASE FITTING. MAINTENANCE REMOVED INBOARD L/H MIDFLAP RIB AND ATTACH ANGLE AT WBL 111, AND RIB FITTING AT WBL 116. FABRICATED AND INSTALLED NEW RIB FITTING AT WBL 116 IAW B737-300 SRM 51-40-02, PG 3, AND RE-INSTALLED RIB AND ATTACH ANGLE AT WBL 111 IAW B737-300 SRM 51-40-02, PG 3, 10. A NEW GREASE FITTING WAS INSTALLED.