Have you rebuilt transmissions before, or done similar jobs? If so, order the manual from CTSC and open it up. But if you don't know what you are looking for, it won't necessarily be cheaper than paying for the repair.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue