I live in a double wide mobile home. Along the front wall in my living room, I have 2 air vents. On this same wall further down in another room, an air vent blows hard. After an inspection, I had to crawl underneath and fix 2 torn ducts. The 2 air vents in my living room still do not blow air. My outside unit is brand new so I know its not the actual unit. I am assumming the ducts are blocked. Is there an easy way to check for bocked air passages? Or is there another problem this rookie home owner doesnt know?