As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF THE CREW NOTICED THE THE LT BLEED TRIP LIGHT ILLUMINATED AND THE LT DUCT PRESSURE READ ZERO. THE BLEED TRIP RESET PROCEDURE WAS UNSUCCESSFUL AND THE CREW PERFORMED AN AIR TURN BACK WHERE PARTS AND MANPOWER WERE AVAILABLE. MAINTENANCE FOUND THE PRE COOLER CONTROL VALVE TO BE AT FAULT AND WAS REPLACED WITH NO FURTHER ISSUES REPORTED.