As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BIL - DOOR WARNING LIGHT ILLUMINATED DURING DESCENT THROUGH 20,000 FEET AT 5.1 PSID, SYSTEM PAGE INDICATED EXIT AT 9A. AIRCRAFT LANDED IN BIL WITHOUT FURTHER PROBLEMS. AIRCRAFT FERRIED TO GEG FOR REPAIR. PROXIMITY SENSOR ADJUSTED AND EXIT AT 9A IAW MM. SENSOR OPS CHECKED GOOD IAW MM. TEST FLIGHT CONDUCTED AND FLIGHT WAS SATISFACTORY. AIRCRAFT RETURNED TO SERVICE.