Newbie here so far love the site. At present my tub drain looks very corroded. It is not leaking but I'm sure at some point it will be and I want to have a plan to repair before that happens. As with most travel trailers, access is cramped at best. There is a removable panel under tub I can get one hand in but I don't know if I can get any tool in there if needed. Any pointers???? Thanks Brad