What was found
AIRCRAFT WAS NOT GROUNDED: ON CLIMB OUT FLIGHT ATTENDANT NOTIFIED THE FLIGHT CREW OF FLASHING CABIN PRESSURE LIGHT ON DOOR 1L WHICH SIMULTANEOUSLY ON THE DOOR SYSTEMS PAGE THE 1L DOOR SHOWED DISARMED WITH THE LEVER CONFIRMED IN THE ARMED POSITION - THE FLIGHT CREW REPORTED THAT THE CABIN PRESSURIZATION WAS NORMAL - WHILE AT CRUISE THE DOOR WAS AGAIN SHOWING ARMED AND THE LIGHT ON DOOR STOPPED FLASHING - MAINTENANCE CLEANED THE L1 DOOR PROXIMITY SENSOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED