I had the PCV heater done on my car (back in June) as well. I've been very firm with them on not washing my car, particularly with a power washer because I'm terrified it will kill the top motor, in which case they won't need to see the new Rambo flic this weekend because they'll see it in person instead....
Now, I don't suppose they power-washed your car, following which the roof problem started?