I have a Bosch double oven, model HBN 45. The door on the top oven closes properly and seems to "spring" into its fully closed, vertical position. The bottom oven door does not close fully and appears to leave a small gap between the seal and the face of the door of a few mm. In addition, the door does not "spring" into position in the same way that the top one does. Can you advise me on how to rectify this please?