No, there's not.I am jumping way ahead here but is it possible that there is a sensor that reads the temp at the bottom of the fridge and then sends way too much when it should not?
Good job replacing the diffuser.
For the door alignment issue, you will need to take the doors off their hinges and put a shim(spacer) on the bottom hinge pin.
If you have a side by side, then just raise the front legs abit underneath. So the gravity closes the doors better.
Is yours a side by side or freezer-on-top refrigerator?