Centax must have a pretty bad warranty or their is more to the story... Standard warranties cover structural defects for 5-10 years so it sounds like these folks but a home without a substandard warranty. Having worked for a home builder fixing latent defects (defects which cause structural damage thus are covered by a structural warranty, ie mold from bad masonry gets on the frame of the home, in order to fix the frame the masonry and mold must be fixed). I'm guessing the house was poorly built and likely has electrical and or plumbing issues. That being said some homes or parts of homes just have charges (i'm a builder not a scientist so I don't know the technically correct term). In some homes the walls become charged and attract dust along the beams creating rather odd shadow like dust lines on the interior walls where the beams are. This can be caused by weather (hot / cold, wet / dry (from running humidifiers), improper insulation, plumbing, electrical issues, etc. but isn't an actual structural defect. I'll venture to say about the same thing is happening in this house but I doubt their list of issues is valid.