As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI OUT, SMOKE IN THE CABIN WAS DETECTED. THE CREW DECIDED TO RETURN TO GATE FOR PROBLEM RESOLUTION. MAINTENANCE FOUND THE ORIGIN OF THE SMOKE WAS A PROBLEM WITH AN ELECTRICAL WIRE ASSEMBLY BEHIND THE NR 2 GALLEY. ROOT CAUSE UNDER INVESTIGATION.