I had a suspension shop pull an old Fox Float RC apart recently and they were able to reseal it with O-rings they had laying around. Risse Racing in the states rebuilds a lot of vintage stuff if you're really desperate. I think my Y's both take a typical 6.5x1.5 shock, so it may be easier to find a working replacement than rebuild the Strata. I keep a Vanilla coilover around the shop as a spare to put on when one of the air shocks start leaking.