As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT ATC AND FLIGHT ATTENDANTS REPORTED FLAMES OUT OF THE BACK OF THE #1 ENGINE / [01] PERFORMED GVI OF #1 ENGINE INLET AND EXHAUST AREA; NO DEFECTS NOTED. PERFORMED #1 ENGINE START PROCEDURE; NO DEFECTS NOTED IAW AMM 71-00-00. A/C OK FOR SERVICE.