if you really think it is coming i from the bolt holes, I would undo the bolts and fit some rubber washers there and tighten them up again. It will let you see if you can stop water getting in the boot without taking the wing off.

Personally, if it's coming in from new holes that you drilled and there is no bolt there, then I would put a blob of silicon there to stop the water. Cheap and nasty in some books, but it will work without taking the wing off.

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