As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSO - DEPARTING MSO TO SEA, IN CLIMB THROUGH 12,000 FT, THE FORWARD CARGO DOOR MASTER WARNING LIGHT ILLUMINATED. AIRCRAFT RETURNED TO FIELD. MAINTENANCE INSPECTED THE FORWARD CARGO DOOR. CYCLED DOOR HANDLE AND WARNING LIGHTS EXTINGUISHED. AIRCRAFT RETURNED TO SERVICE.