GE refrigerator, the right side fresh food door can be closed only it is pushed firml

GE refrigerator Model Number TFX24FHB
Problem: The right side fresh food door can be closed only after it is pushed firmly. Otherwise, it will always leave a small open. I tried to adjust the two slot positions for the two screws on the door outside top, but it did not help. I found the gasket had one broken area. How to fix the problem? Please advise me. Thank you very much. Adam