The throttle actuators cannot be rebuilt. The potentiometers, wiring harness, etc. cannot be fixed, either.
You are going to have to buy a new one if yours is bad.
Yeah, all of us are upset that have 1993-1995 W124's that have the deteriorating wiring harness troubles...
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".