Power steering rack leak 1989 XJ40

I must say this is getting old and my almost three decade old buddy is really trying my patience.

After rebuilding my leaking power steering pump I now have a slight leak at the top of the tower on the rack. Not the usual place for a leak as far as I know. It’s not around the spindle shaft where I would expect but at the plate which is held on with three 10mm bolts.

Looks like this could be repaired without removing the rack … but ?? Any one rebuilt a rack lately ?

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I PM you yesterday.

Rob