As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF DURING PUSH BACK, CAPTAIN REPORTED LOST OF HYDRAULIC PRESSURE AND QUANTITY. DURING CHECK WAS DETECTED A LEAK FROM THE LEFT HYDRAULIC RELIEF VALVE, IT WAS REPLACED IAW MM 29-10-12, TESTED CORRECT.