As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HORIZONTAL STABILIZER TRIM WOULD NOT ACTUATE IN THE NOSE-DOWN TRAVEL DIRECTION (MAIN SYSTEM). STANDBY TRIM SYSTEM FUNCTIONED PROPERLY. FOUND THE MAIN CONTACTS OF THE -B- DOWN RELAY IN AN OPEN CIRCUIT CONDITION. REPLACEMENT CONFIRMED FAULT.