Nonfunctional lighting units will be replaced and the working units won’t be. It will all be determined by the scope of the damage, which it sounds like there is a short to ground somewhere in the connection. If it’s internal to the light itself, that does bring up more challenges, as you have to be worried about corrosion however if it’s in the LED controller and that’s an external unit, it’ll be much easier to replace, and rather a quick part to replace. Also, companies are more willing to repair accidental damage than they are to user abuse, which the pressure washer story falls under accidental.