As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM LIGHT ILLUM ON OVERHEAD PANEL AND EICAS. RESET BOTH SAMS. PERFORMED STAB TRIM TEST PER MEL PROCEDURES AND LEFT PRIMARY TRIM CHANNEL FAILED. NO FAULT BALLS ON THE SAMS. STAB TRIM WORKS WITH FLAPS 5. PROBLEM APPEARS TO BE IN LEFT TRIM LIMIT CIRCUIT. NEED L- STAB TRIM CONTROL MOD. REPLACED LT STCM, NO HELP. FAILS STAB TRIM CUTOFF SWITCHES TEST. REPLACED LT STAB TRIM AIL LOCKOUT MODULE, OP CHECK GOOD.