Thanks to all who replied.
Thanks to all who took the time to reply. Turns out it was the fact that if you hold the button down, it dims the lights. We have owned the coach for 3 years, and never knew that. I don’t feel too stupid (yes, a little bit stupid) because I discussed the problem with the service manager at the dealership, where we bought the unit new, and he was unaware of this feature.
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