What was found
AIR TURN BACK & DECLARED EMER. SPEED TRIM FAIL LIGHT ILLUMINATED. THE STAB TRIM FAILED IN ELEC MODE. R & R STAB TRIM MOTOR IAW MM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR TURN BACK & DECLARED EMER. SPEED TRIM FAIL LIGHT ILLUMINATED. THE STAB TRIM FAILED IN ELEC MODE. R & R STAB TRIM MOTOR IAW MM.