As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF LANDING GEAR HANDLE WAS SELECTED UP BUT GEAR REMAINED DOWN WITH ALL A&B GREEN AND RED LIGHTS ILLUMINATED. GEAR HANDLE WAS SELECTED DOWN, RED LIGHTS WENT OUT. RETURNED FOR LANDING. REPLACED LANDING GEAR CONTROL HANDLE. OPS CHECK GOOD. S/N OFF 120-228.