As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA INFLIGHT T1603/09AUG - RIGHT MAIN GEAR DOOR REMAINED OPEN ON GEAR EXTENSION. DOOR WARNING AND GEAR DOOR EICAS MESSAGE ILLUMINATED. LANDED SEA WITHOUT INCIDENT. REPLACED RIGHT MAIN GEAR DOWN LOCK ACTUATOR LINE AND HYDRAULIC EXTENSION AND RETRACTOR FUSES. SYSTEM GROUND CHECKED NORMAL OPERATION.