As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL THREE LG DID NOT RETRACT AFTER TAKEOFF. RESETTING THE MANUAL GEAR EXTENSION DOOR, IAW QRH, ALLOWED THE GEAR TO BE RAISED NORMALLY. THE FLIGHT CONTINUED & LANDED WITHOUT FURTHER INCIDENT. FOUND MANUAL EXTENSION SYS ACCESS DOOR SWITCH OUT OF ADJUSTMENT. ADJUSTED DOOR SWITCH IAW AMM 32-34-00-820-802. ACCOMPLISHED OPERATIONAL CHECK OF SWITCH IAW EA 257070. THE ACFT WAS GNDED.