I also have 2006 16' Bambi. I was wondering if you fixed your shower leak. I noticed a leak coming from under the wall this past weekend when my wife was using the shower. As I kneeled down outside the bathroom, I see water coming from underneath the two "shower/bathroom" walls (hallway and bedroom). The water can be seen along both walls, but not the front "door" area. I suspected water getting behind the shower pan. I had not thought of a leaky pipe or fitting.
The reason I suspected water getting behind the pan is because I noticed on the inside of the shower, the water proofing wall material along the back seam, is starting to come loose. I need to figure out what type of tack nails were used and caulk, to seal and re-attach. But maybe this is not the problem?