Are you sure the water is from the loose pipe?
Shortly after we bought our 1999 Liberty last year we noticed the once in the while the carpet in the bedroom next to the bath area was wet. I presumed it was from the shower and had visions of taking up the shower floor to fix it. In trying to locate the problem I raised the front of the coach up and lowered the rear, removed the doors (remember you don’t have to unscrew anything on the hinges to remove the doors, just flip the tiny level and the hinge will separate) under the vanities (we have two sinks), and took the panels off the back of area under the sinks. I then ran the shower for 10 minutes hoping to get some insight into where the water was coming from.
Much to my surprise (and relief) it didn’t look like the water coming from under the shower. It was leaking from some (most?) of the many plastic connections that take the water from the main distribution line running along the bottom of the utility chase to the faucets. I could turn the leaking connections by hand (didn’t use a wrench for fear of over tightening) to tighten them and one by one they stopped leaking. I couldn’t get a good hold by hand of the top one that fastens to the faucet, so I got a Channel Lock wrench up there and slowly/carefully tightened the connection to where it wasn’t leaking. Then I turned the water pump on, turned the water on and off at the faucet many times, and no leaks appeared, but we’ll watch it.
There are quite a few connections as the pex or PVC or whatever kind of plastic is used to get from the main distribution line to the individual faucets which include shutoff valves in the lines. I don’t understand why Liberty put in so many connections (I’d provide a picture, but have lots of difficulty posted pictures to PC) rather than just a few and then used braided stainless water lines (or more appropriate for a Liberty Elegant Lady polished copper) above the shutoff valves.
During the the investigative process we discovered the shutoff valve for the ice maker. I’m sure its location is in the Liberty manual and Jeff Rowe probably told me where it was, but seeing it for the first time helps me remember where it is. I’ll use the Brother label maker to create a label to put on the back wall under the vanity for future reference.
So the OP might have two problems: a loose shower drain and leaking plumbing connections. The source of the water might not be the shower drain or it might be augmented by the plumbing connections leaking a bit.