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Jeff, the foamed cap is due to the fact that the filter caps are tall cans of borax and water (if if remember correctly). They are vented at the top and when the filter caps fail and their resistance increases, they overheat and boil over. I've seen it before and it's usually not a big deal. Kinda handy in a way, as it makes for a very obvious failed part. This chassis is in very rough shape, so we'll see what a recap does.
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