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There is a Flashing that goes along the bottom of the Windscreen which has 6 Screws holding it on. The leak in my Gu was from one those Screws on the Passenger side of the Car. You need to remove the Grill cover between the back of the Bonnet and the Windscreen to get at the Flashing. Put Sealant in each of the rubber Grummets where the Screws are and also around the Block that holds the Windscreen up. If you cannot understand my instructions show them to a Person that knows Windscreens and he might understand.
This is a common fault with GU Patrols .The guy at Windscreens O'brien did not know about it but another Windscreen Guy in Bendigo knew the fault as son as I told him the Problem