As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT WITH AIRLOAD WHEN FLAPS 12 DEGREES SELECTED, THERE WAS AN AUDIBLE NOISE AND A NOTICEABLE SHUDDER. FOUND ROUND ROLLER HANGER BOLTS BROKEN ON THE RIGHT INBOARD AND RIGHT CENTER AND LEFT INBOARD FLAP ACTUATOR CANOE FITTINGS. REMOVED AND REPLACED BOLTS FOR NR 2 AND NR 3 RIGHT FLAP ROLLER HANGER SUPPORT. REPLACED BOLTS ON LEFT NR 2 FLAP TRACK ROLLER HANGER SUPPORT IAW DC8 AMM 27-51-03-2.