This video shows what I had to do to get rid of a hard limp condition with codes p2602/P702 on a Mercedes c240 4matic. Conductor plate was replaced but it DID NOT resolve the issue. Solenoids ended up being the problem even though everything pointed to the conductor plate.

The conductor plate for this and other 722.6 vehicles:

https://amzn.to/2wgOl9I

The solenoid kit for all 722.6 transmissions:

https://amzn.to/2vi9SPw

The code reader I use, which works awesome on all vehicle models is:

https://amzn.to/2VyDOlc