As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI, THE FLT CREW REPORTED THEY HAD NO HYDRAULIC PRESSURE FROM THE NR 1 HYDRAULIC B PUMP AND RETURNED TO THE RAMP. DURING MAINTENANCE TROUBLESHOOTING, THEY FOUND A SYS 40 AMP CIRCUIT BREAKER TRIPPED WITH SIGNS OF BEING BURNED. THE FAULTY BREAKER WAS REPLACED AND ACFT WAS RETURNED TO SERVICE WITHOUT FURTHER INCIDENT.