As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A GEAR DISAGREE EICAS MESSAGE WAS RECEIVED WITH A GEAR AMBER WARNING LIGHT AFTER TAKEOFF WITH GEAR HANDLE IN RETRACT POSITION. QRH PROCEDURES WERE PERFORMED AND THE AIRCRAFT WAS RETURNED TO GUM WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE PSEU AT FAULT. THE PSEU WAS REMOVED AND REPLACED AND OPERATION CHECKED GOOD.