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X5 Vacuum pump

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So the Vacuum pump on my X5 40D (N57) is failing. I checked vacuum at the block by removing the tube that goes into the block and there was no vacuum. So it looks like I have a gummed up vacuum pump. Probably carbon inside because after the engine has warmed up the pump frees itself up and I get vacuum again. Looking at my options I could drop the sump and see if the vacuum pump could be serviced. A left field alternative is to use an electrical aftermarket pump and have it certified. I have fitted an electric pump to a friends  big cam V8 Chev and it seemed to work quite well. 

Before I go down that route I am curious if anyone has serviced an N57 vacuum pump? Can it be done? Time is ticking away here so if you have any info please let me know ASAP.

Thanks

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Have you had any oil pressure issues? The vacuum pump and the oil pump are a combined unit and there are rare reported cases of the pump drive failing, maybe worth inspecting.

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No oil pressure issues yet. I have decided I am going to take the sump off and have a closer look.

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Hi did you get any further with this is? I have the exact same issues on my N57 30D X5

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