I have been asked by a general contractor, that is working with an insurance agency on a daycare center that had a fire, to write a letter stating that the outdoor units should be replaced along with duct work and air handlers. My opinion is that there is probably nothing wrong with the outdoor units. The linesets are still in tact and still have pressure on them. The general contractor thinks that because of the fire it could have caused the refrigerant to boil and could have caused damage to the refrigerant therefore causing internal damage to the system. I'm just looking for other input that could justify me stating that the outdoor units should be replaced. The heat pumps are only a couple of years old.