pwconnelly, sorry to hear that you must have had the same plumber I had on my 2019 coach, same leak in the fittings behind the shower valve and pulling the washer was the same solution. They apparently just assembled the plumbing fittings and forgot to tighten them all up.
If your 40M is like mine, there is a wide trim board in the bedroom, that when removed, reveals an opening through the wall to the back side of the washer, you may have been able to tighten the fittings reaching through that opening. I didn't know about it when mine was leaking so I removed the washer also.
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2019 Fleetwood Discovery LXE 40M w/2021 Equinox
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