[amsat-bb] Yaesu g5400B longevity in stroage

I acquired a G5400 az/el rotator that looks to be in pristine condition, apart from some rubber rot. I don't think it's ever been mounted outside in the weather. Since this has been in storage for probably at least 20 years, what should be done with it to put it into service? does it need to be pulled apart and re-greased? can I just replace the rotted rubber parts and call it good?

pictures here:

http://www.pushingbubbles.com/radio-stuff/new-rotator/

thanks

-Eric KI7LTT