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Small leak in colorsteel roof

hi we have a add on to our home with a small colorsteel roof about 1.5 m x 1 m, during yesterdays heavy rain i noticed some damp spots on the wooden beams on the ceiling and a small drop of water accumulates about once every 30 mins, i had a breif look at the roof and theres no obvious damage , i can only assume theres a seal thats failed somewhere, would be great to have someone come out and have and look and repair