As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAXING INTO RAMP & CREW APPLIED PARKING BRAKE, EMER BRK LO PRESS MSG APPEARS ON EICAS WITH NO HYD POWER. ISOLATED MALFUNCTION TO DEFECTIVE NR 2 MLG BRAKE SHUTTLE VLV. REMOVED DEFECTIVE NR 2 BRAKE ASSEMBLY & REPLACED WITH NEW BRAKE ASSEMBLY. OPERATIONS CHECKED GOOD. ACFT WAS RETURNED TO SERVICE.