As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ADVANCING THROTTLES FOR TAXI, NOTICED N1 AND N2 DECREASING ON NR 2 ENGINE. AT THE SAME TIME GROUND CONTROL CALLED TO REPORT FLAMES COMING FROM NR 2 ENGINE. SHUTOFF FUEL LEVER NO FIRE INDICATIONS IN COCKPIT. FLAMES WERE STILL COMING OUT OF NR 2. FIRED NR 1 AGENT, NR 2 AGENT WOULD NOT FIRE. FLAMES EXTINGUISHED AFTER FIRING BOTTLE.