After a shower, I have been having trouble with standing water on the lower right hand corner of the floor outside of the shower. I have checked the piping for the hot and cold water and can't find any leaks. I have caulked around the base of the shower with no positive results. The only thing that I haven't checked is the drain pipe. You can't see it. Does anyone know how to gain access to the shower drain so that I can see if it is causing the leak. Type of trailer: 2004 Solaris Model T-2753 with queen sized bed, no bunks.