How much will an axle seal replacement cost

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I had my car evaluated at a certified dealer last week. I have a 2003 Murano. I am starting to develop several leaks; axle seal left front needs replaced. What is the approximate cost of this? Other findings: Check engine light is illuminated. The following areas are leaking/seeping: Power steering ressure hose, B/S axle seals, oil residue coning from the trans service cover, poss, rear main seal. Eventually, I will get these reparied. Thank you.