98 ml320. I decided i had nothing to lose, so I took up my dealer on an its campaign offering a free 30 point inspection; I was told the power steering seal is leaking. Assuming this is true ( the ml rides & sounds fine), what should be replaced, or should I just add fluid if and when either the fluid level is low or I hear a squeek when the steering wheel is turned (heard this about 6 months ago, & no noises or since I topped off)? Thanks

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)