As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STABILIZER TRIM IS INOPERATIVE WHEN TRYING TO TRIM NOSE UP FROM EITHER YOKE CONTROL SWITCH. IT WILL TRIM NOSE DOWN FROM YOKE SWITCHES. EMERGENCY STAB TRIM WILL TRIM THE STAB IN BOTH DIRECTIONS. PRIMARY STAB TRIM CONTROL CONFIRMED DISCREPANCY FOUND NOSE DOWN ARMING RELAY 507 CH STUCK, ENERGIZED. REPLACED RELAY AND OPS CHECKED GOOD, COMPLIED WITH TASK 27-404 FUNTIONAL TEST OF STAB TRIM.