As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT DURING CLIMB PILOT RECEIVED CAS MESSAGE "HYDRAULIC VOLUME LOW B". AFTER LANDING AND INSPECTING AIRCRAFT WE FOUND THAT THE HYDRAULIC PTU CONTROLLER SOLENOID LEAKING. THE PART WAS REPLACED WITH AN OVERHAULED UNIT AND NO FURTHER DEFECTS WERE DETECTED.