As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE CLIMBING TO 15,000 70NM EAST OF YUL, NR 2 ENGINE OIL TEMP STARTED CLIMBING INTO YELLOW ARC. COMPLETED QRH CHECKLIST AND AFTER 15 MINUTES ACCOMPLISHED ENGINE SHUTDOWN AND DECISION WAS MADE TO RETURN TO YUL. INVESTIGATION FOUND THAT THE FUEL HEAT VALVE WAS STUCK HALF OPEN. VALVE REPLACED AND CHECKED SERVICEABLE, ALL PARAMETERS CHECKED NORMAL ON FIRST FLIGHT FROM YUL TO YYZ.