What was found
DOOR WARNING CAS MESSAGE IN FLIGHT, SYSTEM INDICATED LEFT REAR UNDERWING EXIT. NO AIR LEAKS OR SOUND COMING FROM EXIT, NO LOSS OF CABIN PRESSURE. AIRCRAFT ALTITUDE WAS 14,000 FT, LIGHT EXTINGUISHED AT 5,000 FT. EXIT PROXIMITY SENSOR ADJUSTED IAW MAINT MANUAL AND INDICATION OPS CHECKED GOOD.