Hi Dave
Does the ice maker overflow or it's leaking through?
If it's leaking then the ice maker has to be replaced.
If it's overflowing then you can try to adjust the amount of water coming into the ice maker first, before replacing any parts. Remove the front cover from the ice maker and you'll find the adjustment screw on the right side. Turn it half way clock wise and check how it will fill up. Possible you'll have to turn it more. Let me know if adjustment helped.
- The part number for the new ice maker
AP2984633
The part number for the water inlet valve has been changed by the Whirlpool.
Good luck.
Gene.