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The fault code P2112 is for an electrical failure of one of brake solenoids. Here is a picture as to the location of the solenoid. The other fault codes are for the transmission slipping causing an implausible gear ratio. When ever I have this fault code, it is a good idea to check the fluid level (Pull drain plug while the engine is running,transmission in park and warmed up to about 100 degrees Fahrenheit, should have slight stream of oil coming out). If the fluid level looks good, then drop the pan and check the condition of the oil, look for debris (metal or excessive clutch material). If all of this checks out, then there must be a failure in the valve body some where. Technically you should replace the complete valvebody since the solenoids are matched. There are some companies that you can send it out and have it repaired. Here is one of them http://gnnmotors.com/mercedes-benz-722.9-valve-body-repair.html Let me know if you have any questions.