As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL AT PHX EN ROUTE FOR FLL DOOR WARNING SYSTEM INDICATED THE L-4 DOOR WAS OPEN, REJECTED TAKEOFF AT 100 KTS. MAINTENANCE CLEANED AND LUBRICATED TARGETS AND PROXIMITY SENSORS, DOOR WARNING SYSTEM OPERATIONAL CHECK WAS GOOD.