Originally Posted by LR Techniker

Tough call with such a wide range of codes. Park Input means the trans and shifter don't match. Could be an issue inside the valvebody (Mechatronics) or it could be an issue in the shifter (its a great collection point for spilled liquids).

Incorrect Gear Ratio could be something as simple as low fluid, or a split Mechatronics seal. If either the pan is leaking or the electrical sleeve is leaking, it very well could be low on fluid. The Mechatronics seal needs to have the valvebody dropped for inspection.

As for the 3-4 shift error, that concerns me. I have seen Mechatronics cause this (either internal worn valve bore or failed solenoid) or it could be an issue with the "E-Clutch" inside the transmisison. The shaft bushing for this clutch wears out and causes pressure loss for that clutch and sometimes the clutch fails since it is the smallest clutch pack inside the transmission.

Probably not the answer you want to hear, but I think Abran is right on the money with rebuild and/or replace. You can start by getting a reman Mechatronics from ZF and I would say you have better than 50/50 chance of fixing, but the last few I quoted, I found that for an additional $1500 more, you can get a reman trans (still from ZF) which comes with the same Mechatronics as you would have bought, but also a completely gone through internal (clutches, seals, bushings, etc...) and also a reman torque converter. I really stopped offering just a Mechatronics because it wasn't a good value compared to a whole unit.