As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT OF SLC, RECEIVED STAB TRIM & MACH TRIM CAUTION MESSAGES . RAN QRH, COULD NOT GET TRIM ENGAGED. AFTER REPEATED ATTEMPTS, GOT CH 2 ENGAGED. RETURNED TO SLC. REMOVED FO'S DISCONNECT SWITCH, CLEANED AND REINSTALLED PER MM 27-41-30. OPS CHECK SYSTEM SEVERAL TIMES. GROUND CHECKS GOOD.