As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 2836 PHL. A GEAR DISAGREE MESSAGE DISPLAYED ON EICAS UPON GEAR EXTENSION. THE CREW ADVISED THAT THE GEAR CAME DOWN AFTER 20 SECONDS. THE AIRCRAFT WAS FERRIED TO PHL WHERE MX COULD NOT DUPLICATE THE FAULT. MX REPLACED THE PRIORITY VALVE, SELECTOR VALVE AND GEAR DOOR SEQUENCING VALVE FOR PREVENTITIVE MX.