As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE FROM ANC AFTER GEAR RETRACTION, RIGHT WING GEAR DOOR REMAINED OPEN AND GEAR REMAINED EXTENDED AS CONFIRMED BY BOTH PRIMARY/ALTERNATE INDICATION SYSTEMS. DUMPED FUEL TO MAX LANDING WEIGHT, RETURNED TO DEPARTURE AIRPORT. CHECKED RIG OF DOOR SEQUENCE VALVE, OPS CHECK GOOD. LUBED GEAR AND C/W GEAR SWING, ALL CHECKED NORMAL. COULD NOT DUPLICATE ON GROUND.