** It has been making a grinding noise that becomes louder everday **
The original GE dishwasher motor had an internal cooling fan which was spot welded to the motor shaft. That weld often breaks free allowing the fan to rub up against the motor housing causing a horrendous squealing/grinding noise when used. Since the motor itself was spot welded together, there is no way to take it apart to just refasten the fan. Just a replacement motor is not available anylonger so a whole new pump and motor assembly will need to be installed to correct that problem.
On the bonus side, GE has redesigned the motor used in the unit which is now a better design with more starting torque and even quieter than the original was (when new). As long as the rest of the machine is in good shape (tub and racks not rusting, etc.) the repair may be worth while.
You can see a photo of the replacement GE dishwasher pump and motor assembly at the following link. It is not that difficult a job to do as it fits directly in place of the original designed one.