havasu is speaking of the welded seams inside the water heater tank. If the anode rod is depleted, the inside of the heater is starting to or is rusting out, thus the comment about the seams rotting.
And as has been said, at 10 years old, if a water heater starts to give problems, you would be wise to give serious thought to just replacing it. You MIGHT get another 10 years out of your current unit, or you might get another 2 months.
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