As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LANDING GEAR WAS RETRACTED AND ALL GEAR LIGHTS EXTINGUISHED. FLIGHT CREW RECEIVED A RADIO CALL THAT THE MAIN LANDING WAS NOT FULLY RETRACTED. AIRCRAFT RETURNED AND MAINTENANCE WAS NOTIFIED. MAINTENANCE PERFORMED A GEAR RETRACTION TEST. THE EXPLOSIVE LINK WAS ADJUSTED AND THE LANDING OPERATED NORMALLY IAW MM. (K)