HELP! 06 A3 3.2 flashing PRNDS wont select a gear

[James_quattro]

Hi guys new to this page, have had many audis and vws from stock to built, and Ive finally come across a situation that has me perplexed.

06 A3 3.2 quattro s-line, DSG AT
Backstory on car: recently purchased 6/23 from an older gentlemen who claimed the mech unit was replaced last year, provided me with the documents and it seems it checks out.

issue: coming to a stop the car will drop rpms and throw an engine, esp, and sometimes abs light, PRNDS will flash with full blocks behind it, and i am unable to get a gear to select whatsoever. Cycle the key on and off and quickly place it into manual 1 and it will take off (but not always right away) occurs almost exactly 230 miles on the dot every time after letting it sit for a day.
Codes scanned by a snapon and returned 12 codes (see images)
Upon scanning the car, the voltage was showing roughly an average of 13.3 volts which to me was low. I went ahead and replaced the alternator with a refurbished Bosch and works great - but didnt erase the issue. Im perplexed and beside myself, no shops that i know of in maine will touch a DSG unless its the stealership.
Anyone thinking the shop messed up the mech unit replacement or maybe didn't properly to the adaptation process after install?

 

[James_quattro]

Here are the reports / receipts from the Shop who took on the repair. I have not contacted them yet. Supposedly the unit has a warranty but those are usually one year correct?

 

[NHN]

You need to resolve the power train bus issue, then see what's happening, you could try a gateway module, could be wiring, hopefully they did the mech unit job as per spec.

 

[James_quattro]

You need to resolve the power train bus issue, then see what's happening, you could try a gateway module, could be wiring, hopefully they did the mech unit job as per spec.

Thanks, just to note these 12 codes were taken before the new alternator was installed, i have yet to have my friend scan them again

 

[James_quattro]

Thanks, just to note these 12 codes were taken before the new alternator was installed, i have yet to have my friend scan them again

Thanks, just to note these 12 codes were taken before the new alternator was installed, i have yet to have my friend scan them again

Thanks, just to note these 12 codes were taken before the new alternator was installed, i have yet to have my friend scan them again

Also apoke with the shop just now and basically after the mech unit install the owner had the issue again and brought it back where they “could not replicate the issue” and basically they said the washed their hands of it because of the time they were giving to diag the car….. great….