As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AND GEAR RETRACTION THE AMBER GEAR DOOR OPEN LIGHT REMAINED ON AND LEFT MAIN INDICATOR WAS RED. GEAR LOWERED NORMALLY AND AIRCRAFT RETURNED TO BOSTON WITHOUT INCIDENT. REPLACED LEFT RETRACT ACTUATOR TO STRUT LINK. SYSTEM GROUND CHECKED NORMAL OPERATION.