It depends on how bad it is leaking. If you are not losing that much fluid,then leave it alone. My power steering fluid was low about a year ago,I added fluid and have not had to add since. The pitman arm was a little wet with power steering fluid but it was not leaving a puddle under the car. I would monitor it by checking the fluid often to see how bad it is.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T