I don't know whats up with the servos, but you should be prepared to service the deck. These have many electolytic capacitors that leak over time, you may have to do some replacement.
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I have a rebuilt Teac 4010S and had the work done at the following place.
Northwest Audio Service
2309 3rd Ave.
Seattle WA. 98121
Tech is John Ledbetter
It was very resonable for repairs,But I'm sure if your not local shipping cost could be much.
The machine runs like brand new.
He has a vast technical knowledge on all Teac early machines.