The voltage regulator has temperature compensation so you might see 14 volts on a hot day as the internal resistance of the battery gets higher and higher voltage is needed to achieve a full charge. This is all assuming voltages accurately measured at the battery NOT the OBC or scan tool. I would say the OP has his problem fixed and shouldn't be looking further unless it's just to learn more.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)