Labor cost to remove old transmission and install new transmission? Car is Rwd

What is your question?

Car will not move in any gear and transmission fluid has metal shavings in it. It also smells like it was burned. Engine light code indicates transmission slipping.

What makes this problem better or worse?

Originally worked better when hot, now doesn't work at all

How long has your 2007 Mercedes-Benz S550 had this problem?

Few weeks