Crankshaft Bearings replacements

I need to know if the rod and main bearings can be replaced without taking the engine out of the car, also need to know if the Crankshaft is damaged and need to be replaced or machined if its possible to take it from the bottom without removing the engine.
Sebring 2002, 2.7 L :banghead:

if you have to do anything w/ the crankshaft and/or bearings, the engine will have to come out.