Baltimoretrainworks,
Jerry my original 711's are still in perfect shape, however I purchased another used set that needed some work, most of the 072 Lionel switches have similar parts and engineering. However there are some parts that are not really intechangable and these you might have to acquire off another 711 switch, or try to make yourself.
Although there are some internal parts of the 022 Lionel switch that can be interchanged, most of the parts are usless for repairing the 711's. If the 711's are not in decent working order, I would pick up the 072 Lionel switches instead.
Parts for old 711's are getting harder and harder to find, however the controllers
from 022's and 072's also work the 711's.
PCRR/Dave