I've been using a rice cooker that is over 2 years old. The non-stick coating of the pot has totally worn off. Once the non-stick coating comes off, the rice tends to stick to the pot resulting in wastage.
There is an easy way to keep using your old rice cooker pot without the rice to stick to the bottom of the pot. Just cook your rice as you'd normally cook. After the rice is cooked, don't try to scoop out rice immediately. Rest it in "warm" mode for 10-20 mins. Then the rice will come off easily.
If that does not work, when your rice is cooked, switch off your rice cooker so that it does not keep warming the pot. Or remove the pot and put it on top of a cold surface (such stainless steel bench). Leave it there for about 8-10 minutes. You'll be able to remove rice without it sticking to the bottom of the pot.
You can now keep using your rice cooker for a few more years perhaps!