As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 280 AND 275 KTS RECEIVED AMBER ANNUNCIATOR (AP PITCH MIS-TRIM) AND (TRIM DN), MANUALLY DISCONNECTED AUTOPILOT AND ATTEMPTED TO TRIM DOWN MANUALLY AND ELECTRICALLY, BUT AIRCRAFT WAS FULLY TRIMMED NOSE DOWN TO THE STOP. IN THIS CONDITION AIRCRAFT STILL PITCHED UP. FOUND THE ELEVATOR TRIM CONTROL SYSTEM OUT OF RIG. RIGGED THE TRIM SYSTEM IAW MM. CHAPTER 27-31-00 SYSTEM OPS CHECKS GOOD AT THIS TIME