Miles on the transmission? Are you sure you have the right fluid level? That's one symptom of the low fluid causing low pressure. When you switch the gear selector into reverse, does the light comes ON? Always?
If you have the same transmission like mine 5HP 24 it takes 9qt of fluid with the torque converter. Probably, the shop replaced 8qt because they drained 8qt. But the Question is : Did they checked, if it had the right fluid level before draining it? Sometimes they are in a rush and they are assuming only.
Here in first post is the chart with fluid specifications. http://www.bimmerfest.com/forums/showthread.php?t=519818&highlight=
If you are not sure what tranny you have, you can decode your VIN# www.realOEM.com
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