Since it's on your hands and in working order don't disregard it completely. Ciruit boards can last a long time, if it's a nice machine in other respects I would at least try to do a bit of DIY maintanance; cleaning, and being extra careful with the oiling, but it probably needs some. If you need a light weight portable machine, it might be up to the job and worth the effort. Just remember that when parts start to fail it's probably not worth hunting down replacement parts.