While it's not "per the book", a leak that takes 7 years to get a little low (compressor still runs) would prbably respond well to a recharge (with gaugeS). Get your 609 certificate, a buddy that knows a little about A/C, a couple of cans of R12 from Ebay and read here:http://acsource.net/acforum/index.php?sid=167da32d8a79d9c298ac568cf8cf5672
and here:http://www.autoacforum.com/

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The Golden Rule

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