As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) STAB/MACH TRIM CAUTION MESSAGE. DISCONNECTED AUTOPILOT AFTER STAB MACH TRIM MESSAGE AND APPLIED QRH. CREW INDICATED THAT TRIM WAS STUCK AND WOULD NOT MOVE WITH QRH PROCEDURES. LANDED ACFT WITH FLAPS 20 NORMALLY.EMERGENCY SERVICES NOTIFED. NO ADDITIONAL DETAILS AT THE PRESENT TIME.