Hi Tony,
This is an old thread but I was interested to know how it all worked out for you? Did you recode the module? I am chasing a MOST failure now (SOS error , No Audio, No bluetooth) and I believe it is my TCU 1.5 that has failed. Used modules are $25-80, I assume I will need to code them with my Vin but I haven't the tools to do this yet. Im pretty sure its not so difficult to setup DCAN + WinKPF or Bimmerkeeps protocol. Im also sure I can find a local person to code it for a reasonable fee. (Northern Va). I am comfortable with diag tool but Im fearful of bricking my car with an incorrect coding tool. I also don't have a battery stabilizer. Is there a low cost battery stabilizer out there?