As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT CAPT NOTED SMOKE AND ELECTRICAL ODOR WHICH APPEARED TO BE COMING FROM CAPT'S EFIS SYSTEM. CREW DECIDED TO RETURN TO GATE WITH NO FURTHER INCIDENT. CND ON GROUND, SYSTEM OPS CHECKS NORMAL. REMOVED AND REPLACED CAPT EFIS SCREEN FOR PRECAUTIONARY MEASURES.