As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT WITH THE AIR CONDITIONER ON HIGH, SMOKE ENTERED THE CABIN FROM AN UNKNOWN SOURCE. THE PILOT CONCLUDED THE MOST LIKELY CAUSE WAS THE AIR CONDITIONER. TURNED OFF AIR CONDITIONER, OPENED VENTS & WINDOWS. MADE UNSCHEDULED LANDING WITH SMOKE DISSIPATING AS LANDING PROGRESSED. UPON LANDING FOUND HOSE TO AIR CONDITIONER CONDENSER SEPARATED FROM FITTING AT THE CONDENSER. CONFIRMED THAT RETURN HOSE SPLIT & MEL'D AIR CONDITIONER.