As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELLED BURNT RUBBER WHEN AIR CONDITIONER WAS ON DURING FLIGHT FROM AIRPORT FUELING STOP TO HOME PLATE HOSPITAL. SUSPECTED COMPRESSOR BELT. DIVERTED TO MILLARD AIRPORT AND OUR AREA MX FACILITY TO INVESTIGATE. THERE WAS NO PROBLEM FOUND WITH THIS EVENT. SUSPECT THE ODOR WAS POSSIBLY EXHAUST ODOR FROM ANOTHER AIRCRAFT