As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LEVEL OFF AT FL 240 FROM 250 ELEVATOR TRIM WHEELS MOVED FORE AND AFT RAPIDLY AND APPEARED TO BE JAMMED. THEN GOT A TRIM FAIL MAP WARNING. DISENGAGED THE AUTO PILOT AND CONFIRMED TRIM WHEELS WERE FROZEN. CONSULTED QRH AND HAND FLEW TO BELOW THE FREEZING LEVEL. TRIM WORKED OK ABOVE FREEZING TEMPS. REMOVED AND REPLACED BOTH ELEVATOR TRIM ACTUATORS IAW MM 27-32-02. OPS CHECKS GOOD. S/N: 633, S/N OFF: 824 RT, S/N: 631, S/N OFF: 339 LT.