I think I need to replace the waterpump on my keurig65

The Keurig leaks water during the pump operation, I have replace water resivoir thinking it was o rings. Water leak continued. I took keurig apart and is seems to have a back leak from the water pump, when water is pumped in heat resivoir some water reverses direction and back leaks out of bottom of keurig, at the point of water filter. I am unsure of which parts I should change. Can you give me some suggestions? I don't know if it is worth salvaging coffee maker......but I hate just chucking things in the trash.