As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RAISING THROTTLES TO 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. SHUT OF FUEL LEVER NO FIRE INDICATIONS IN COCKPIT. FIRED NR 1 AGENT, NR 2 AGENT WOULD NOT FIRE. FIRE TRUCKS REPORTED FLAMES EXTINGUISHED AFTER FIRING BOTTLE.