As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE FROM AIR CONDITIONING SYSTEM ACCUMULATED IN CABIN AFTER TAKEOFF. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED LEFT AND RIGHT AIR CYCLE MACHINES, LEFT AND RIGHT PILOT PRESSURE REGULATORS, AND LEFT AIR CONDITIONING PRESSURE REGULATOR VALVE. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.