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That smaller pipe IS the vent pipe..I have no idea how it gets to the roof and I probably do not want to know. That small pipe will have to be replaced as it is welded into the black tank.The larger pipe was leaking right under the floor level. There is no way you can see that leak unless the pipe is removed. I hate to be the bearer of bad news but I think you are going to have to hack that tank out of there and replace and re plumb it and only then will you be able to see ALL the leaks. All our pipes were welded in and as I recall your 3400 is only a month or two away from mine. Sometimes I suspect that 10 3400 made on the same day would not be plumbed the same???
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