Efis? Is that like Eiffel? As in Eifel tower?

I think there 3 300's on the line with an efis. Funny, I heard a lot of airframes had efis when they were originally delivered. Because management thought efis would cost too much money to upkeep, the efis was removed. Now I hear the steam gear costs a small fortune to keep running because parts are no longer supported and it's very labor intensive.