Water will not leak through continuous aluminum sheet. There must be a pin hole, or there is a different location where the water is getting in and it is running to that location, probably because it is low. If the water is pooling on the top, and not going away, it stands to reason it isn't leaking at that location. The location of the actual leak and where the water presents on the inside may well be different locations. They commonly are. I would suggest looking to other possible locations.