As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2458: NR 2 ENGINE OIL GAUGE NOT REGISTERING. AIRCRAFT WAS DIVERTED. MAINTENANCE CLEANED AND REINSTALLED CONNECTOR P16 ON MOT ITT SENSOR IAW Q400 AMM 70-00-15-400-801 NR 2 ENGINE. GROUND RAN NR 2 ENGINE. NR 2 OIL TEMP REGISTERING WITHIN NORMAL LIMITS. OPS CHECK GOOD. ITT READS NORMAL (WITHIN LIMITS). NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.