As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS UNCOMMANDED INCREASE OF DECENT RATE. RUNAWAY TRIM SUSPECTED. THE PITCH TRIM RELAYS K021 AND K022, PN 974.20.01.212 WERE R & R IAW THE WDM 27-40-00. THE STAB TRIM OPS CHECK, STAB TRIM RUNAWAY AURAL WARNING FUNCTIONAL CHECK AND AUTO PILOT SYSTEMS OPS CHECKED, ALL TESTED GOOD IAW THE AMM 12-A-27-40-00-00A-903A-A AND 12-A-22-10-00-00A-903A-A.