What was found
ONT - DIVERSION - FLT 809 - EN ROUTE FROM PHX TO SFO AND AT CRUISING ALTITUDE A NR 2 ENGINE ROLLBACK OCCURRED. THE FLIGHT CREW DECLARED AN EMERGENCY AND THE AIRCRAFT DIVERTED TO ONT. AT FL 200 THE NR 2 ENGINE WAS RESTARTED AND OPERATED NORMALLY FROM THIS TIME ON. THE EMERGENCY WAS CANCELED AND THE AIRCRAFT LANDED SAFELY AT ONT. MAIN ENGINE CONTROL S/N WYG35471 WAS NO FAULT FOUND BY VENDOR BENCH TEST. MAIN ENGINE FUEL PUMP, P/N 708600-5, S/N 17559 ALSO WAS NO FAULT FOUND BY VENDOR BENCH TEST, 4 EACH O-RINGS AND THE FUEL FILTER ELEMENT WERE REPLACED PRIOR TO RETURNING THE UNIT TO SERVICE.