As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON TAXI OUT THE F/A SAW AND SMELLED SMOKE IN THE CABIN. AS THEY WERE DISCUSSING THE SMOKE APPEARED TO DISSAPATE. CREW ELECTED TO RETURN TO GATE. WE THEN DID A EMERGENCY DEPLANE CHECK. RIGHT BEFORE SHUTDOWN, WE RECEIVED A RT PACK AUTO FAIL CAUTION. THE SMOKE SMELLED ELECTRIC.