Leaking Front Differential Input Seal

[tzetter]

I have a very small leak of diff fluid from the front diff input seal. Anyone know how "involved" this repair will be? Fluid on the garage floor is about the size of a dime each morning. I checked the fluid in diff and it seems ok (not low).

02 320 w/ 72000 miles. I replaced Diff fluid f&r at 60,000 as indicated.

I'm more nervous about the dealer screwing something ELSE up while fixing this than the actual repair! I took it to a reputable indy and he lacked the special tool needed to perform the fix and said he had never seen this leak on an ML before.
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02 ML320 Sport