We have an A.C.E. 30.1 and found that the caulking around the frame for the shower curtain thingy was poorly done. Ran a new bead of caulking from about mid-way down the side, across the bottom, and up the other side on both the inside and outside of the frame, and have had no problems since.
You might try that first, just to make sure that's the problem before trying to get under the bottom of the shower.
__________________
|