As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE B-LOOP FIRE WARNING PLACED ON MCO BY FLIGHT CREW DURING TAXI OUT DUE TO FLICKERING. AT 17,000 FEET, NR 1 ENGINE A-LOOP STARTED FLICKERING ACCOMPANIED BY WARNING BELL AND LIGHT. ENGINE SHUT DOWN, BOTH BOTTLES DISCHARGED AND AIRCRAFT RETURNED TO JFK.