I have one of those dryers. Mine broke a while back, wouldn't start when you pushed the button. Learned the hard way how to take it all apart, what controlled what, and how it worked on a basic level. Helps that I'm a mechanical engineer.
Can you confirm that the heater element actually works? As in, when you start the dryer is it heating up? Should be immediately obvious - mine got red hot after about 10 seconds.
Any number of reasons why it wouldn't be drying, but before you start replacing stuff, Google it - I found that there are tons of people who have asked every conceivable question about those dryers. If you do decide the fix it, the refurbish kit is reasonably cheap (like 30 bucks) and quick and easy to install - includes rollers, drive belt.