the dryer heats up but slow drying clothes. I blew out the solid piping to the outside of the house (with a speed leaf blower) cleaned the exhaust pipe from the back of the dryer and made sure the lint trap was clean on the front of the dryer. Clothes are still taking an extended amount of time to dry. Could it be in the duct work inside the dryer that is occluding the airflow? what measures can I do to try and fix this problem?