I have the 400E in for it's 90K service, and the rep called me to say the front hubs need greased. Is this really a big deal ? I have greased a few front hubs in my day, but they want around $400 for this little item. I told them I will probably do it myself, but is it really a big deal? Did the search, and nothing.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K