If you put on the new seal rings and know they are seated properly and it still leaks then you have a bad EHA! No real way to fix them that I have seen. As for testing one! The only thing you can do is follow the test procedures of checking the amperage drawn as specific RPM's from what I have seen! And no I do not know the procedure. Just that one exists.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....