After a little google searching, I decided to open the access panel. After a quick test run, I was able to locate the origin of the noise. A few minutes later, the blower wheel is exposed. It was not attached to the shaft anymore and the fitting had been rounded out. Parts replacement was very easy. Remember to take off the Front Panel of the dryer, and disconnect the Door Safety Switch to gain access and to remove the lint trap assembly. Dryer is now working almost like new again!