We have a 2007 Agila A basic trim with a roof leak which manifests as a wet headlining behind the sun visor and around the top of the A post. There are no roof rails just the black filler trim in the channels. Under the rear cabin light is bone dry. There is a lot of chatter about the problem on social media but no conclusive fixes. What would a trained Master Tech suggest. Any help VERY welcome.. Nick & Joan Rogers Belfast