If the seals are old they scar easier. Sometimes some old mud (or similar) dries hard on the extreamities of the chrome fork legs and when you put the forks under compression this gunk is hard enough to get past the dust cover and slightly scrape the fork seal. It is possible to try and clean out any of this gunk that may have gotten caught under the seal lip using a tapered match by lifting the dust seal and pushing the match end (use a knife to taper the end first) between the seal and the fork leg and then pulling it around the full circumfrence. This is only sometimes going to stop the leak and then only for a while.
But first try releasing any excess pressure in the forks (as Ian said) before trying any of this!
It's fairly easy to change the seals (assuming you can get them) yourself if the leak persists. You can find a copy of the WP Extreme Workshop Manual on the net using www.google.com for a step by step guide. If in need ATF (automatic transmission fluid) can be used temporarily in the absence of proper fork oil.
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