Discovered a water leak/drip behind the rear wheel coming from some sort of bulkhead. I believe it is coming from under the shower tray/waste trap somewhere, dripping onto the garage floor and making it's way underneath. Any ideas of how access to the plumbing? Presumably from below from the very narrow garage or does the shower tray lift off somehow? Just plucking up the courage to have a go but wondered if there were any hints before I start - apart from the obvious of taking it to a dealer! Thank you in anticipation.