mc602

I have a mc602 which I plan to keep for the rest of my life. I bought it from audio classics around 2011. it's condition is a-1. it was a demo unit. I think it meant like new , no scratches. I'm 65 years old. I only use it like 8 hours a week. I told my son that when I die it's his. what maintenance should I give it so it will last another 20 years?