As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED THE DOOR 4R ARMING INDICATION INTERMITTENT AFTER TAKEOFF. ARMED ON GROUND AND SHOWED DISARMED IN THE AIR. FLIGHT ATTENDANT GENTLY PUSHED HANDLE AND INDICATION SHOWED REARMED. MAINTENANCE CLEANED R4 DOOR ARM PROXIMITY SWITCH CONNECTOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED.