Dryer is a commercial model with a coin accepter. Had to take timer cover off to get at the nut that holds down upper cover. Took out screws in the lint trap and removed the trap. Unhooked the door switch. Removed front door screws and lifted the door out of the way and removed the drum. Cleaned all the lint out of the machine. Replace the support rollers which were bad. Replaced the belt and tentioner which are wear items. Inspected the seals which were ok. Reassembled the unit and tested it. Runs very quiet now.