As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT 867 - EN ROUTE EWR-ORD, SMOKE IN CABIN WITH A ELECTRICAL SMELL. CHECKED GALLEY EQUIPMENT AND LIGHTING. RETURNED EWR AND LANDED WITHOUT INCIDENT. SUSPECT GLYCOL INGESTION FROM APU CAUSE OF SMOKE. RAN ENGINES AND NO SMOKE DETECTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)