Here is what worked for me.

Go to Addons - GSX - Customize aircraft. Click on the CS 737, click on Pax 1 on the left side, select on Door open/close checks as FSX #1, in the position section enter -1.80, 9.00, 2.65 (thanks YVRLGBAvi8r!) in the Angle box enter 8.00 and save. Worked for me! If you already had success, then this can be for others having the same problem.  Best regards.