As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING TAXI AIRCRAFT BEHIND REPORTED FLAMES COMING OUT OF RIGHT ENGINE TAIL PIPE. THIS HAPPENED ABOUT 10 MINUTES AFTER START. ACCOMPLISHED AFT SUMP OIL SSTEM INSP IAW AMM 79-00-00 FOUND NO LEAKS OR COKEING AT OIL SUPLY AND SCAVENGE TUBE. DURING RUNS SAW NO FLAMES FROM EXHAUST NOZZLE. ALSO NO PARTICLES FOUND IN CHIP DETECTORS. AIRCRAFT RETURNED TO SERVICE.