the call is up to you, if it was my home, i would replace all the cast i could.
but, if you want to try and save money..we can just cut out bare minimum
you can make up your mind after you see the inside of the pipes. they are either clear or plugged. most likely junk in them
sounds like your washer drain is an area drain,,,we cant do anything to it.
at some point, you do need to put a grate over the hole
When we replace the stack, can we just connect the washer/kitchen sink/dishwasher drains into the new stack? I don't know what an area drain is. I assume it's bad? I'll be honest with you. I never noticed that the washer drained into the floor until I went down to take these pictures.