As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR LIGHT CAME ON IN FLIGHT ON MWP WITH CHIME AND NO INDICATION ON S/O PANEL. EMERGENCY CHECKLIST PERFORMED. LIGHT WENT OUT WITH NO CREW ACTION. PERFORMED DOOR WARNING SYSTEM TEST. FOUND SWITCH ON BULK CARGO COMPARTMENT DOOR STICKING. CLEANED AND LUBED IAW M/M 52-71-00, OPS CK GOOD.