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well, looking at it from the inside with one of those dentist mirrors I guess it is factory. It just looked strange when looking from the outside because of the raw edges, but I guess it was just the casting. So my dead spot is not a crack on the plenum, will have to keep looking for the source of the problem..
Thanks for the replies.

Marcelo
hows your tps ?????

it dosent have to be surrounded by water to be an island