Product review (5 stars): Wow, that was an easy replacement!
We really appreciated all of the responses to my question about the switch.  They were very helpful.  One response said to remove the cover/grill over the motor to install, but my husband just pulled out the old switch and inserted the new one without removing any other parts.  So, now, my 18-year old Model 511 Sub Zero refrigerator is like new -- and at very little cost!