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Leak in Roof

***URGENT*** Ceiling board sodden, clearly a leak from the roof but I cant tell where. Looks to be a slow leak that has rotten the board and heavy rain fall last night has caused a bulge. only damp insulation on top and damp board, crumbles to touch. Need repair of ceiling board and leak proofing the roof ASAP. FYI access is restrictive, but the point where the damage is, is next to the ceiling access point.