As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1387 - DURING TAXI, ODOR OF OVERHEATED ELECTRICAL CIRCUITS REPORTED. RETURNED TO GATE ORD. ODOR CONTINUED AND MAINTENANCE VERIFIED ODOR. AFTER EXTENSIVE INSPECTION AND CLEANING NO ODORS WERE NOTED. COULD NOT DUPLICATE ODOR. SYSTEM GROUND CHECK NORMAL OPERATION. (M)