As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWENTY-FIVE MINUTES INTO FLIGHT, LEVEL CRIUSE A/P PITCH TRIM AMBER WARNING ILLUMINATED. UPON DISC A/P MANUAL TRIM WOULD NOT TRIM NOSE DOWN, ONLY NOSE UP DID NOT RE-ENGAGE. RETURNED TO RDU. INSPECTED AND FOUND HORIZONTAL STAB ACTUATOR BAD. REMOVED AND REPLACED ACTUATOR FOR HORIZONTAL STAB IAW AMM 27-42-01, OPS CHECK GOOD IAW AMM 27-40-00.