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Leak check / detection - one in garage and one is roof

Hi there, Leak check / detection - one in garage (upstairs is bathroom) and one is roof (ceiling has small watermark) Just wanted a quote for a leak detection service. I am not too sure where the water stains are really coming from. One is on the lounge ceiling (small and light water stain) and the other one is from the garage ceiling (small water stain). Hence, just needed to know if there are repairs that need to be made and if there is then will ask for a separate quote on that. For now, I just need to know if there is a leak somewhere. It's just that now nothing is leaking and I can just see the small stains. Thanks.