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Also is caused by festering water in the washing machine supply lines when they are not in use. A pretty well documented cause. The water goes bad in those lines, and when the bathroom sink faucet is used, it draws some of the nasty water out of those lines because it is the closest plumbed faucet to the washing machine supply lines.
Since I will never have a washer/dryer in my rig, I just disconnected those water lines and capped them.
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