How do I change the neutral saftey switch in my 2002 s60? All help appreciated.

My s60 would not start again today! I tried to start in Park and neutral several times and it would not do anything. I went out and wiggled the shift cable on top of the Neutral Safety Switch and i heard something pop. I went in and tried to start and it started. Is there something in there that could be hanging up?

Neutral safety switches are commonly located either at the base of the shifter, under the console, or at the forward end of the tranny - where the shifter cable connects to an arm sticking out.