As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED SMELLING SOMETHING HOT IN THE COCKPIT, NO SMOKE PRESENT. INSPECTED THE ACFT, FOUND THE AIR CONDITIONER BELT BROKEN & THE COMPRESSOR SEIZED. BELT WAS REMOVED, DRIVE LINE INSPECTED, ACFT SYS MEL'D & ACFT RETURNED TO SERVICE.