If the pipes and valves can be called from lack of of the wall as well as the tiled wall itself isn't damaged, it may be possible to improve the leak from the backside.
You can get your shower faucet replaced by a plumber or get it repaired. http://Www.Rise.Sc-comic.com/doku.php?id=how_we_made_45_000_fixing_and_flipping_a_mobile_home