806 interior lights does not work but indicator for open door does why help?

IT SOUNDS AS THOUGH THE SWITCH IN THE DOOR HINGE/S ARE FAULTY OR STICKING WHICH PREVENTS THEM COMING ON EVEN THOUGH SENSOR SHOWS THEM OPEN, OR ITS THE MAXI RELAY UNDER THE STEERING COWLING THAT IS At Fault MAYBE HAD SAME PROBLEM & I DID BOTH, GOOD LUCK, JOYCE