As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A TRAINING FLIGHT, THE CREW REPORTED A PITCH TRIM RUNAWAY WITH AUDIBLE WARBLE. STABILIZER TRIM AND AUTO PILOT SYSTEMS WERE OPERATED AND TESTED IAW THE AMM 12-A-27-40-00-00A-903A-A, 12-A-22-10-00-00A-903A-A. PROBLEM COULD NOT BE DUPLICATED. RELAYS K021,K022 AND K241 PN 974.20.01.212 AND 974.20.01.214 WERE CHANGED AS A PRECAUTION. NOTE: RELAYS TIME IN SERVICE ARE AS FOLLOWS K021=1774.3 K022= 4962.8 K241= 4962.8.