What was found
(CAN) AT CRUISE, A SNAPPING NOISE WAS HEARD. NR 1 TR CB POPPED. NR 1 MAIN FUEL TANK AFT FUEL BOOST PUMP CB POPPED ALONG WITH NUMEROUS C/P LIGHTS. #1 ENGINE OIL TEMP INDICATOR, CAPT'S AUX. PITOT STATIC AND NO SMOKING & FASTEN SEAT BELT SIGNS ALL NOT OPERATING. AS A PRECAUTION, ATC NOTIFIED FOR DIRECT DESTINATION IN CASE OF FURTHER ELECTICAL PROBLEMS. ON INITIAL DESCENT, THE TR BUS SUDDENLY POWERED BACK UP AGAIN & AIRCRAFT LANDED WITHOUT INCIDENT #1 TR REPLACED IAW MM 24-21-0 AND CHECKED SERVICEABLE. NO FURTHER PROBLEM DURING SUBSEQUENT FLIGHT.