As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIMARY TRIM ANNUNCIATOR COMES ON INFLIGHT. SECONDARY TRIM FAIL LIGHT ILLUMINATES ALSO AND STAB TRIM WILL NOT MOVE. TROUBLESHOT STABILIZER SYSTEM; FOUND HORIZONTAL STABILIZER ACTUATOR CONTROL UNIT DEFECTIVE. REPLACED AS REQUIRED; PERFORMED FUNCTIONAL CHECK FLIGHT; NO DEFECTS NOTED.