Mine has developed a leak on the passenger side just above the seat belt (it is actually pouring through the seat belt height adjustment cover). I'm assuming it is either a blocked drainage pipe or the drainage pipe has become detached. I'm a little reluctant to tackle removal of the headlining myself so will probably have the dealers do it. Has anyone done a diy fix to know how long it takes?

did mine..take a pillar plastic off(1 torx screw).remove grab handle above front door & b pillar cover..you can then pull liner down enough to see sunroof out let above b pillar..about 1hours work

Many thanks for the information-it sounds straightforward so I might give it go