As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - AIRCRAFT RETURNED TO FIELD WHEN ON CLIMBOUT THE NUMBER 2 ENGINE FUEL TEMP GAUGE FLUCTUATED BETWEEN 60 AND 80 DEGREES. TEMPERATURE GAUGE INDICATED NORMAL ON GROUND. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE NUMBER 2 FUEL TEMPERATURE BULB. OPERATIONAL CHECKS AND LEAK CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE.