Well, on a sort of related note...
I'm an aerospace engineer and like working on just about anything mechanical. I've thought about starting up some kind of business, and wondered if an independent spa repair business might be the thing. I live in a large metro area. Dealers, is there a demand for independent spa repair people, or do dealers prefer their own in-house departments?
With all the big box, and internet sales going on, I thought this might be a growing market