leaking pushfits

somewhere under the shower there is/are leaking pushfit T connector(s) on my 7 year old Broadway.
 Definitely not leaking from "tails" at the sink tap or shower tap.
How can I access the under shower tray joints, or even just inspect them?

Are you sure about that?

The sink drain hose is known to be a weakness, and several people (including us) have had it detach from the spigot under the sink, and dump water whenever it goes down the plughole.

There will be a square panel on the shower side of your swing wall, and if you remove that you will be able to see at once if that's the problem. (I'm fairly sure the 2010 models have the swing wall?)

Only four screws, so worth checking before you dismantle the van!