As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/RDU - FLT 7617 - DURING CLIMB, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO RUDDER TRIM FROZE AND WOULD NOT MOVE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND LUBRICATED RUDDER JACK SCREW TRIM TAIL. OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)