As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 9800 - THE NR 2 TANK FUEL LOW MASTER CAUTION ILLUMINATED. THE NR 1 AND 2 FUEL GAUGE INDICATES EQUAL. THE CHECKLIST WAS COMPLIED WITH. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE NR 2 FUEL TANK LOW LEVEL SWITCH. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.