Performed dryer vent cleaning. Dryer vent, flex hose and lint trap are all clear of lint and debris at this time. Dryer is functioning properly at this time. Recommend dryer vent cleaning every 1-2 years. Thank you for your business! Customer just had dryer vent cleaned recently and is having an excessive buildup of lint in the trap. Customer may need a backdraft damper due to the short vent run of problem persists.