As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB, THE CREW OBSERVED LT HYDRAULIC PRESSURE LOW WITH LIGHT ILLUMINATING. HYDRAULIC PRESSURE INDICATED ZERO. QRH PROCEDURES INITIATED AND AIRCRAFT RETURNED TO BASE WITHOUT INCIDENT. MAINTENANCE REPLACED THE LT EDP. OPERATIONAL CHECK CARRIED OUT IAW MM 29-10-05. NO FURTHER INCIDENT DURING SUBSEQUENT FLIGHT.