As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT OUTBOARD LOWER FLAP ROLLER JAMMED IN TRACK CAUSING EXTENSIVE FLAP DAMAGE AND INABILITY TO RAISE FLAPS TO FULL UP POSITION. UPON LANDING, FLAP ROLLER FOUND WORN THROUGH TO ATTACH HARDWARE INDICATING IT HAD NOT BEEN ROLLING, BUT SLIDING IN TRACK. HAVE FOUND SIMILAR 'STUCK' ROLLERS ON OTHER 172 AIRCRAFT DUE TO IMPROPER INSTALLATION OF WASHER STACK ON BOTH SIDES OF ROLLER.