As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3224 OUT OF YQK, WHILE LOADING PAX HAD SMOKE IN CABIN WITH AN ELECTRICAL SMELL. SMOKE APPEARED TO BE COMING FROM BELOW THE SEATS ON THE RT SIDE. THE SMOKE STOPPED WHEN POWER WAS TURNED OFF. MAINTENANCE FOUND SMOKING COMPONENT TO BE SUPPLEMENTAL AC MOTOR. REPLACED THE AC COMPRESSOR MOTOR P/N 1134194-1, S/N ON 1600, S/N OFF 812 IAW CMM AAR SF340 AIR COND SYSTEM, 10/4/2 OPS CHECK GOOD.