Every dishwasher is assembled differently but the general concepts are the same. Our first challenge was removing the spray arm. We could tell that it unscrewed but no matter how hard we turned it didn't seem to budge.
Lesson Number One: rotating things usually have reversed threads to keep them from unscrewing themselves.
Much easier when turned the opposite direction. As my wife likes to say: righty tighty, lefty loosey. In this case it was righty loosey.
Spray arms are pretty boring and uncomplicated. It's always possible that something has plugged one of the holes, but that's about it except for being cracked or broken.
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