My 2006 2720SL does NOT have the access panel that several earlier posts refer to. Instead, there is a square box, about 2 inches deep and maybe 10 x 16 inches, on the wall just above and abutting the tub. This box is removable (you'll have to recaulk it when you put it back), and gives access to both the tub faucets and the outside shower plumbing.
As has been asked before, what year and model TM do you have?
Bill
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