Sorry, the 1-2 shift issue I was thinking of was in one of your links.

Some tests can be done without dropping the pan. Second step is checking the valve body with the transmission still installed.

Let us know what they find out.

__________________
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