Again not sure about your layout.
In my coach immediately below the shower is a storage compartment and on the ceiling of that compartment is a metal plate held on with 6 screws. According to the plumbing diagram if I removed that plate I would have access to the shower drain. Based on my diagram I have 3 of those access plates throughout the coach.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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