As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ENROUTE TO PWM THE CREW REPORTED RECEIVING A STAB TRIM AND MACH TRIM CAUTION. THEY DECLARED AND EMERGENCY AND WILL CONTINUE TO PWM. AT FL310 RECEIVED STAB & MACH TRIM CAUTIONS. C/W QRH, TRIM WOULD NOT RE-ENGAGE. ***AIRCRAFT REMOVED FROM SERVICE*** MX IN PROGRESS