Posted for <n98pb@sbcglobal.net>:

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 Seems to be the nature of the beast.  I can attest to the same symptoms for
 the past 6 years.  New seals stop it for a few weeks and back to a very very
 slow leak.  If there is an answer, I'd like to hear it also.
 Pat Brunner
 N98PB 620hrs LNC4