As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENG RUNNING FOR 5 MINUTES TOWER ADVISED US WE HAD FLAMES COMING OUT OF NR 1 ENG. NO FIRE INDICATION IN COCKPIT. WE DID A PRECAUTIONARY SHUTDOWN OF THE ENG & RETURNED TO GATE. R & R NR 1 ENG REF WC 29-7100-1-0900 & 29-7100-1-4900. OPERATIONS & LEAK CHECKED GOOD. OK TO CONTINUE.