What was found
MALFUNCTION: FLAPPERS PN 3170719-2 WERE MODIFIED AS PER INSTRUCTIONS IN HONEYWELL SB 3202222-36-1888 IAW FAA AD 2020-16-51 IN FEB 2021, AND WERE INSTALLED ON CUSTOMERS AIRCRAFT. UNIT WAS RETURNED TO REPAIR FACILITY SHOWING SIGNS OF BINDING AND CORROSION.
PROBABLE CAUSE: CORROSION AROUND THE SLEEVE BEARINGS.
RECOMMENDATION: REPLACE ALL CORRODED PARTS AND UPDATE RECOMMENDED INSPECTION, CORRECTIVE AND PREVENTATIVE ACTIONS.