Power door locks?

I have a 1964 Thunderbird, and I can''t identify a feature.  On the map light panel, there is a vacuum switch labeled "D".  There are no existing vacuum lines connected to it, due to a rat infestation before I purchased it.  The ports are labeled red, green, and white.  There are two vacuum lines, red and yellow, that are attatched to a vacuum pot in the door.  An accuating rod goes to the lock mechanism.  The red and yellow vacuum lines run under the dash.  I was wondering if anyone had any information about this. Thanks.