What was found
PILOT REPORTED RUDDER TRIM JAMMED IN FLIGHT. MAINTENANCE INSPECTED AND WAS NOT ABLE TO DUPLICATE THE DISCREPANCY ON THE GROUND. MAINTENANCE INSPECTED RUDDER TRIM SYSTEM CHAIN, CABLE, BLOCKS, LUBED RUDDER TRIM ACTUATOR SCREW ASSEMBLY AS PRECAUTIONARY MEASURES AND RETURNED THE AIRCRAFT TO SERVICE WITH NO FURTHER DISCREPANCY.