My washer makes a loud squeaky noise while at the end of the spin cycle. Also, it makes a humming sound while draining slowly.
Noises like this are almost impossible for us to diagnose because we really need to be there to hear the type and location.
I am thinking the problem is in the pump, that the squeaking you hear is probably going on all the time and you only hear it at the end after the spin is slowing down. A pump problem would also explain the slow drain.
I would remove the pump, check the hoses for obstruction and try replacing the pump if after you clean it out and put it back on things do not improve.