As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3785 PWM/MSP AT THE GATE CREW RECEIVED LT ACM (AIR CYCLE MACHINE) OVERTEMP CAUTION AND SMOKE INTO COCKPIT. LT ACM DEFERRED PER MEL 21-51-11. AIRCRAFT INSPECTED IN MSP AND FOUND THE LT ACM SEIZED. ACM REMOVED AND REPLACED PER BOMBARDIER AMM WITH OPERATIONAL CHECK PERFORMED WITH NO DEFECTS.