[Islandtrader]

After cleaning them up look real close for deep pitting. Then take a ice pick in the deep spots and see if it will poke thru. If not then follow Dennys suggestion and get a pressure test.

If there are not a lot of pits, a Aluminum welder would be able to spot weld some of the deeper pits. However this is an economy of scale. So approach it with openness and don't make a foolish decision based on what it is going to cost you...because it may cost you something you can't buy back.