1995 E320 throttle flap actuator

[captain]

Check engine light is on in the car. No signs of any strange behaviour. The car runs beautifully but was brought to an MB dealer for a diagnosis.
Reads a 022 code for throttle flap actuator. Dealer says the part has to be replaced at a cost of $3450!!! Just wondering if this part can be cleaned and/or lubricated and if this is common? Any help would be greatly appreciated.

thanks