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Spouting/flash leaking into roof

I'm in mount wellington and have a 49m2 brick and tile garage which has been converted into a granny flat. The spouting on one side is leaking into the roof and causing a drip in the ceiling. The side that's leaking is hard up against a block wall and the spouting is a piece of flashing that goes up overthe wall. I have tenants living in the flat and need it sorted relatively short notice.