As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER PUSH BACK AND WHILE TAXIING FOR DEPARTURE, FLIGHT EXPERIENCED A BLUE HYDRAULIC SYS LOW PRESSURE. IN CONSULTATION WITH MAINTENANCE CONTROL, THE FLIGHT RETURNED TO THE GATE. RESOLUTION BLUE HYD SYS ACCUMULATOR REPLACED IAW AMM 29-12-42 BP401. FUNCTIONAL CHECKS CARRIED OUT. OK FOR SERVICE.