How do you repair an amana refrigerator door that doesn't seal when shut?

Check the alignment of the hinges a heavy door or a sudden impact can knock them, out of alignment. The half of the hinge on the refrigerator side should be adjustable so loosen the bolts and have an assistant hold the door squarely against the unit and tighten the bolts.

Also the seal may be bad, this is available at an appliance parts store or online, just google appliance parts warehouse, the seal is held on with adhesive.