On completion of a cycle, my ML520 was showing flashing red light against the door lock. On pressing the Start button the door lock can be heard to fire 6 times but the door remains locked. I pulled the release lever located on the bottom of the machine and opened the door. After a little research I decided that the problem was the door interlock. I have today fitted the new interlock but the same 6 clicks are heard from the door lock when the Start Button is pressed. Any ideas where to look next?