If the pan gasket is the embossed metal with rubber like the transmission pan then there should be no need to retorque, it doesn't hurt but I don't think it's going to be the answer.

If you can get a vice grip on the bleed screw that will usually break it loose.

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