I also have a leak around the windscreen and it is the usual problem, the windscreen surround has to be replaced. I've been looking for one for about 6 months but I always seem to be a bit late in the race ('sorry mate, its gone'). According to an interesting US website the windscreen problem is created by using the air conditioning unit which draws moisture into the frame and the moisture stays there and rusts out the steel. This scenario results in a new windscreen surround every 10 years. If you don't use the air conditioning the surround does not rust.
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