Gedda, I had exactly that problem with mine, the red light did not come on. It was the white plastic operating arm (you can see it in Chris's picture) that was stiff on its pivot. I cleaned it thoroughly in spirit, then dried it and worked it back and forth vigorously, while applying spray grease. This freed it up enough so it works 100% now, no problem at all. Note - there wasn't anything wrong with the microswitch itself (the thing with a little green rubber tit on it) but it was the actuating arm that was the cause of the problem - I think this is quite often the case from what I read on here.
Hope this helps - I think you will need to take the assembly out to sort it like I did, but it's not too hard, unusually Haynes is quite good on this subject.
Cheers
