As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AFTER PUSHBACK, AFTER BRAKE SET LEFT HYDRAULIC BRAKE PRESSURE WENT TO ZERO PRESSURE. AFTER PUMPS ARE TURNED ON AND OFF AGAIN, LEFT HYDRAULIC BRAKE PRESSURE BLEEDS DOWN QUICKLY. ACCOMPLISHED TASK IAW AMM 32-40-00-101. LEAK AND OPERATIONAL CHECK GOOD.