I have a leak in the roof membrain somewhere. I say somewhere because I simply cannot tell where it is. I have flushed the area with a garden hose and apply far more water than a light rain will deposit. However, I can barely get a drip. It appears water it is running down an exterior vertical metal support beam, rusting out the joint between two horizontal metal beams, and deterierating the plywood sofit. There are no leaks in the scuppers nor is there evidence of leakage of the drainage couplings and piping. I don't know what to do next.
Pictures of the roof area would help. It could be coming in a wall and traveling along beams. If there are multiple layers it could be coming in anywhere and rivering between layers and showing as a leak in a completely other area.
You can have an infrared scan performed. There are also low voltage tests, which I am not all that familiar with, both of which shold be performed by trained professionals and won't be cheap.
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