My kenmore 90 series used to dry clothes so fast, now have to run things on cotton 2-3 cycles of 40 min or more. I always clean the lint screen as required. But there does seem to be lint in the area on either side. I am not sure how to check pilot or any of those things. Help!! Any ideas?

Give this video a watch and see if this helps you get a start...
YouTube - How to repair a Kenmore 90 Series clothes dryer heater coil (http://www.youtube.com/watch?v=f1rebeCMVsk)
Good Luck Bill...