Upon arrival tech began inspecting as much o the duct work as possible from underneath and outside the home due to not having access inside. Tech opened up 3 locations and inspected under house and did not see and disconnect lines. Tech was able to gain some access under home beside system but could only make it so far due to low crawl space. Tech did not see any fallen lines. Homeowner stated issues of no airflow are in the L shape where the chimney is which is the lowest section of the house. Homeowner is gonna see when tenant would be available to allow access inside home and call the office to schedule. Will need a smaller tech to go in crawlspace.