How do I get to a leaking rear window wash tube?

I have a 1994 Ford Mondeo. The only fault I have ever had with it since new! When I activate the rear wash, water trickles out of the jet, but most drips out from the roof interior, and even onto me in the drivers seat sometimes.

Is there a pipe connector in the roof that has worked loose or is leaking? Is it easy to get to, or will I have to rip out the ceiling interior?