As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA - FLT 4500 - DURING CLIMB-OUT, THE LEFT ENGINE PGB OIL TEMPERATURE WAS READING 5 DEGREES BELOW GREEN ARC. AIRCRAFT RETURNED TO LGA AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT TEMP CONTROL VALVE. AIRCRAFT RETURNED TO SERVICE. (M)