Hello all, kind a new to this site. I need some help with my X5 transmission and thought this would be the best place to start.

Vehicle: 2005 BMW X5 3.0i automatic transmission, 18" staggered wheels.
Issue: going into Tranny Fail-safe mode
What it's doing:
The SUV seems like it doesn't want to shift out of 1st gear and revs up high, when it does shift it seems to slip and rev up. It does it going from 2nd to 3rd a little bit but not as bad as 1st and then shift smoothly from 3rd to 4th with no issues but gone from 4th the 5th it will shift hard. After a few seconds of doing that it will go into transmission fail-safe mode. If I drive the vehicle and the standard manual mode it will shift good from 2nd to 3rd but if I let it creep up in second gear it will going to transmission failsafe mode, but if I wrap it up fast and shift and third shift perfectly and all other gears but still a hard shift to 5th.

Codes pulled with GT1:
34 EGS: Gear monitoring 2
246001: Faulty shifting
246002: Kickdown shifting not possible
345001: No passive shifting of slip control possible


Things I have done to her so far:
-Change the TCM computer
-Change the transmission fluid and filter (oil a little brown but not bad and there was not much contamination with minimal particles on the magnet)
-Pulled DME and inspected it, I found corrosion on pins and on circuitboard, when is much corrosion off as possible but have a new DME on order but with the storm in the north east and my DME coming from Jersey I don't think I will see it for a few days..
-Cleared the tranny adaptions.
----None of it helped..

I am going to try and switch out the DME and harness but what is everyone's thoughts on that. Plus how do I reprogram the DME for my X5 with the GT1 software? I bought a used one out of a 2005 X5 same motor and same part numbers.
So, any help or input would be great before I park it and save up the money to get a new/used transmission.
Thank you for any help!!!!!!!!!