What was found
SEA - ON FLIGHT 2366, ON TAXI FOR DEPARTURE, OUT OF SEA, SELECTING FLAPS UP, GOT A FLAP POWER CAUTION LIGHT WITH THE FLAPS STUCK AT ABOUT 5 DEG, RAN ABNORMAL CHECKLIST, RESET CIRCUIT BREAKER AFTER RESETTING FLAP POWER CIRCUIT BREAKER THE CAUTION LIGHT REMAINED ILLUMINATED. MAINTENANCE REMOVED AND REPLACED THE FUEL CONTROL UNIT. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.