I put some Lucas Oils power steering stop leak in mine and it lasted till the box wore out about another 20k miles.
But the seal replacement can be a pig (10) if the steering drop arm decides to not cooperate, the seal replacement I have on good authority doesn't work in a lot of cases. So you end up having to bite the bullet and replace the lot ! Just done that on my 110 at 150k so not too bad just worn out not leaking though.