The same thing happened to me with my Pfaff 262 as seen on the right in avatar. I bought her brand new in 1968 and used her constantly. It was folded down into that cabinet for 8 years with stuff stored on top. Then one day I said, time to reunite! It took more than just a cleaning and oiling to get all features working but after a trip to the shop for servicing it has been a workhorse since. Gotta love those old mechanicals.
BTW, I am retiring. Last day at work is June 10th! Then I can sew sew sew!