Kessy Module Swap?
 

Turns out my kessy module needs replacement. What are my options other than having the dealer do it ($2300)..? I searched Google and noticed a few have had success swapping with one from the same year car with matching identifiers also seen a post where the individual only swapped the eeprom? I'm ready to buy the necessary software would just like some guidance to ensure I purchase the correct parts and software as well as the proper procedure. I have a background in Desktop Support and my father was a lead mechanic for much of his life so I'm fairly confident in diy. Any help is beyond appreciated, thanks in advance.
2004 A8l with a regular key fob not push to start. I can provide any other relevant info if needed.