As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT MADE PRECAUTIONARY LANDING DUE TO CREW SMELLING SMOKE IN FLIGHT. MECHANIC RESPONDED TO HELICOPTER. UPON ARRIVAL DISCOVERED AIR-CONDITION BELT TO BE SHREDDED. REMOVED BELT/REMNANTS. MEL'D AC SYSTEM PER AMC BK117C2 MEL. GROUND RAN AIRCRAFT. NO DEFECTS NOTED.