After my indy replaced both side of the outer CV boots, he indicated my transmission sealing sleeve for the electrical connector is leaking. He show me the connector has oil on it and want $750 to fix it (labor + parts).

Is this a good price? looking into this thread it seems this can be a DIY?

Thanks

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2004 X5 4.4 Sport --- for her
1998 GS400 --- for me
1992 Legend -- totaled
1995 Civic EX -- stolen