As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF WE SELECTED LANDING GEAR UP. THE GEAR DID NOT GO UP FOR APPROXIMATELY 60 SECONDS. WE DID RECEIVE A LG LEVER DISAG MASTER WARNING. GEAR WENT UP WHEN WE SELECTED FLAPS 1. WE RAN QRH THEN RETURNED TO THE DEPARTURE AIRPORT. THIS IS CURRENTLY A WORK IN PROGRESS.