As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING LIT ICING CONDITIONS DEVELOPED AT FL270 THE ENGINE ANTI-ICE WAS ACTIVATED FOLLOWED BY THE AIRFRAME ANTI ICE SYSTEM, SHORTLY AFTER THAT THE NR 1 AND NR 2 ENGINES STARTING LOSING RPM. THE CREW SWITCHED TO AIR START AND AT FL255-250 BOTH ENGINES RESTARTED. THE AIRCRAFT WAS DIVERTED TO ATL.