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Yeah man! Like you I like to try to sort stuff myself as at least I know it'll have been done properly, but as you say, tech is moving on so much its hard for people to maintain and BMW (sure other manufacturers as well) make it this way so you have to take them in.
I always like to understand how something works just to scratch the itch of learning if nowt else.
Hopefully someone informed will pitch in on here with the info
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