Frigidaire dryer FEZ831AS1 squeaking

Hi, my Frigidaire dryer FEZ831AS1 squeaks really loud and high-pitched every time I run it. The squeak starts and stops at random. What parts should I consider changing? Thanks for your help!

Most likely the problem is a bad rear bearing (12 on the [B]diagram[/B]). You also may want to check the front felts (#23 & #24) and the front glides (20).

Here are the breakdown diagrams and http://www.appliancepartspros.com/partsearch/model.aspx?model_id=111038

Gene.