Removed the caps on the upper and lower hinges and the two screws of the middle hinge. Removed the wire spring on the lower hinge. Lifted and tilted the mullion enough to remove the broken top hinge and install the new hinge. Installed the door mullion on the upper and lower hinges. and re-installed the two screws on the center hinge. Installed the upper and lower caps, locking in the hinges. Re-installed the wire spring.