This is a typical problem for the MKZ, Fusion and Milan. Trombone's suggestion to purchase one is the right way to go with just a little mechanical ability. I've already replaced one on my 08 MKZ and expect to do the same soon on 08 Fusion. I assume KennyB has already repaired his, but for others this may be helpful If this happens to you, in the mean time, if anyone has this issue and are waiting for the part to come in, there is a trick for still being able to open the door. Pull the broken handle about 1/2 way then pull the lock lever next to it and it will pop the door open.
BTW, enjoying the 14 MKZ just added to our Ford lineup.
