As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 4 FLAP TRACK MAKING GRINDING NOISE AND VIBRATING DURING FLAP EXTENSION AND RETRACTION ON THE RIGHT WING. FOUND THE UPPER DEAD WEIGHT ROLLER CAUSING THE NOISE. REMOVED THE ROLLER AND CLEANED THE ROLLER AND SHAFT AND RE-INSTALLED. CHECKED ADJUSTMENT IAW AMM 27-52-00-802. NO OBVIOUS DEFECTS NOTED. OPERATED FLAPS NORMALLY WITH NO NOISE OR VIBRATIONS.