As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT LOST STAB AND MACH TRIM, WOULD NOT RE-ENGAGE. RETURNED TO FIELD. ON APPROACH MOMENTARILY GOT TRIM BACK THEN LOST IT AGAIN. REMOVED AND REPLACED CAPTAIN'S YOKE PITCH TRIM DISCONNECT SWITCH IAW CRJ AMM 27-41-30. P/N ON: 996-0013.