As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE POSITIONING INTO TAKE-OFF POSITION NR 2 ENGINE FLAMED OUT. FLIGHT RETURNED TO GATE FOR INVESTIGATION. RESOLUTION, AS PER AMM 72-00-00-200-026A NR 2 ENG PS3 FLEX SENSE LINE REPLACED, AS PER AMM 73-21-60-420-052-A. NR 2 ENG ECU REPLACED AND TESTED VIA MCDU, AS PER AMM 73-21-10. NR 2 ENG HMU REPLACED. NR 2 ENG GRD RUN CARRIED OUT SATISFATORY ON CHANNEL A AND B, NO LEAKS. (TC# 20180423013)