Looks like it. Check here: http://www.peachparts.com/shopforum/showthread.php?threadid=96423

Remove the cap and "flick" the shrader stem; see if it reseals, or have a shop replace the valve core with the tool that is listed in the above thread.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)