CONCERN: Dryer takes too long to dry clothes, dryer does get hot though. DIAGNOSTIC AND CAUSE: Tested dryer for proper heater element operation. Heater operation is good. Inspected dryer air flow at the duct flume, air flow is normal at this time, no signs of flow restriction. Cause, Wall vent clogged with lint. CORRECTION: Performed dryer vent cleaning, tested for restrictions, operation now normal