Where is the TCM located and how to replace it? on 1997 Chrysler Town & Country

My 1997 Town & Country 'Service Engine Soon" light came on and I checked the car with my CarMD checker and it suggests that I replace the TCM and/or the BCM. The car does not run any different than before. Do you have any suggestions?

1 answer
before spending all that money, get a diag to confirm. free code pulls only identify a system failure, not a part failure.
very expensive guess. make sure it has failed before replacing it.

Roy