As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RED (PITCH TRIM) ANNUNCIATOR WOULD ILLUMINATE INTERMITTENTLY WHEN DESCENT COMMANDED. THIS WOULD SOMETIMES OCCUR AS THE AUTO PILOT WOULD ATTEMPT TO TRIM. AUTO PILOT WOULD NOT DISENGAGE. PITCH TRIM ADAPTER REPLACED 31.4 HRS PREVIOUS DUE TO A DIFFERENT DEFECT. ANOTHER TRIM ADAPTER WAS INSTALLED, PROBLEM RECTIFIED.