As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PARKING BRAKE EICAS MESSAGE WHEN PARKING BRAKE LEVER RELEASED. AIRCRAFT RETURNED TO BLOCK AND WAS GROUNDEDD BY MAINTENANCE. MAINTENANCE REMOVED AND REPLACED THE PARKING BRAKE VALVE 32-44-04 OPS NORMAL. PART EFFECTIVITY VERIFIED. AIRCRAFT RETURNED TO SERVICE.