As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEPARTING, UPON RETRACTING THE MLG, THE LT INBD GEAR DOOR DID NOT INDICATE IT HAD CLOSED & STOWED. CREW ELECTED TO RETURN TO THE AIRPORT TO INVESTIGATE. SUBSEQUENTLY, THE INBD GEAR DOOR UP SWITCH WAS DETERMINED TO BE DEFECTIVE & WAS REPLACED WITH A NEW SWITCH BY MOBILE SERVICE PERSONNEL & ACFT WAS RETURNED TO SERVICE WITHOUT FURTHER OCCURRENCES.