As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RETRACTING THE LANDING GEAR THE RED GEAR HANDLE LIGHT REMAINED ILLUMINATED. RAN QRH AND THE LIGHT STILL REMAINED ILLUMINATED. EXTENDED THE LANDING GEAR AND RETURNED TO OUR DEPARTING STATION. A NORMAL LANDING WAS EXECUTED WITH NAY FURTHER INCIDENT. R & R NLG UPLOCK SWITCH.