As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, THE CREW REPORTED HAVING HYD NR 1 LOW PRESS CAUTION MESSAGE. QUANTITY OF THE HYDRAULIC RESERVOIR WAS DROPPING FAST. CREW COMPLIED WITH THE QRH AND RETURNED TO THE BASE. FOUND HYDRAULIC LEAKING FROM THE HYD EDP AT THE PORT CAP. EDP WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.