Maybe try some "Berrymans tranny/powersteering conditioner/ sealer"...that stuff works really good.

I once had a major PS leak on my JAGs steering box...it completely sealed all my PS fluid leaks in my Jag XJS in about a weeks time of using that stuff....that was about a year ago...still no leaks...simply amazing!

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91 MBZ 300SE
88 JAG XJS V12 Coupe
76 LANCIA Scorpion