My understanding is inspection should be free. If the "seefu" think it is due to sand and stone from your building's water pipe, then it is fair that you pay for it. Cause you are supposed to clear the water after your building's water tank is cleaned. This kind of damage is not due to wear and tear or malfunction of the appliance. I think a lot of washing machines have a filter in the water inlet to prevent that from happening, don't know about Fortress brand.