As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION OF AIRCRAFT PER AD 94-07-08 (SB 727-57-127), THE HYDROPRESSED WING RIB AT LT WS 686.5 WAS FOUND CRACKED IN 2 PLACES AT THE LOWER FLANGE. ONE CRACK WAS AT THE AFTMOST FASTENER HOLE, THE OTHER WAS AT THE THIRD FASTENER HOLE FORWARD FROM THE AFT END OF RIB. SUSPECT CAUSE: FATIGUE.