As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTICED A BURNING SMELL COMING FOR THE A/C. TURNED THE A/C OFF AND DIVERTED TO VR164A TO INSPECT THE BELT AND SEE IF IT BROKE. AFTER INSPECTION NOTICED THE BELT SLIPPED SLIGHTLY OFF THE PULLEY AND WAS THE CAUSE OF THE BURNING SMELL. NO HAZARDS WERE SEEN AND FLIGHT WAS CONTINUED WITHOUT A/C ON.