As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI FOR DEPARTURE, FLIGHT CREW HEARD A POPPING NOISE, WHICH WAS THEN FOLLOWED BY A SMOKE ODOR IN THE COCKPIT. FLIGHT RETURNED TO THE GATE AND MTC INVESTIGATED, FOUND THE RMP PANEL WAS THE ORIGIN OF THE ISSUE. FOUND DAP NR 1 FAN FAULTED. DAP NR 1 REPLACED IAW AMM 23-51-01. ALSO HAD FAULT CODE 34322004CLU. TROUBLESHOOTING CARRIED OUT IAW FIM 34-32-810-804-A00 MRC2 VIDL FAULT CLEARED.