But that's a broad category. There are a lot of instruments that need repairs and maintenance that are not pianos, and they tend not to cross instrument categor

But that's a broad category. There are a lot of instruments that need repairs and maintenance that are not pianos, and they tend not to cross instrument categories, or even individual instruments. A flute repair person will not likely also repair oboes, for instance. Also, piano repairs and piano tuning are not always done by the same people.