As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORT: "ON CLIMB NR 2 OIL TEMP OBSERVED TO BE 108 DEGREES AND INCREASING. POWER REDUCED. QRH PROCEDURES ACTIONED, AIR RETURN ADVISED BY MX WATCH. NORMAL APPROACH - LANDING CARRIED OUT." MAINTENANCE REPORT: "LINE MX TROUBLESHOOTING CONFIRMED FAILURE OF THE NR 2 OIL COOLER BYPASS VALVE. VALVE ASSEMBLY REPLACED & GROUND TESTED IAW THE ACFT`S MM. ACFT RETURNED TO SERVICE WITHOUT FURTHER INCIDENT."