What was found
PDX FLIGHT NR 2417: DURNG CLIMB, NR 1 FUEL TEMP ON RD WENT TO 99 DEGREES AND THEN REMAINED STEADILY HIGH 90'S. TURNED PUMP ON PER EMERGENCY CHECKLIST AND TEMP BEGAN GRADUAL DECREASE TO 69 DEGREES. AFTER SEVERAL MINUTES, TEMP CLIMBED TO 75 DEGREES. REMAINED ON FOR SEVERAL MINUTES AND THEN DESCENDED TO LOW 40'S DURING DESCENT AND LANDING. MAINTENANCE REMOVED AND REPLACED NR 1 FUEL TEMP SENSOR. OPS AND LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.