As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 7063600) ON INITIAL CLIMBOUT, THE LANDING GEAR LEVER WAS UP, BUT LANDING GEAR WAS STILL DOWN. RAN THE QRH AND WE WERE ABLE TO PUT THE GEAR UP. DE-BRIEFED FLIGHT CREW, SUSPECT MAN GEAR EXT ACCESS DOOR WAS OPEN. AFTER DOOR WAS CYCLED WHEN QRH CHECKLIST WAS RUN, GEAR OPERATED NORMAL.