As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF FROM KRFD TO KLRD SELECTED GEAR UP AND " DOORS NOT LATCHED" LIGHT REMAINED ILLUMINATED. ALT LIGHTS WERE OUT. TEST SWITCH SHOWED LEFT HAND DOOR AT FAULT. RAN CHECKLIST, CYCLED GEAR, BOTH THE ALTERNATE AND MAIN DOOR LIGHT WOULD NOT EXTINGISH. FLIGHT CONTINUED TO KLRD WITH AN UNEVENTFUL LANDING.MAINTENANCE FOUND LOOSE HARDWARE ON LEFT MAIN DOOR UPLATCH SWITCH. HARDWARE WAS RESECURED IN ACCORDANCE WITH DOUGLAS DC-8 MAINTENANCE MANUAL.OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.