Ecu Engine Denso Jag XK8 1996

Hi, i’m seriously in trouble. In the workshop told me that is necessary repair or change ecu.
It’s Denso Unit and my car is one of the first series …VIN …004280 that fits ECU p/n LJA1410AK or Denso 079700-6513. I’m inexperienced, i’ve found in US a site that install a repair kit and in Holland Ecu Repair…someone has previous experience? Who has a jaguar xk8 first series if he has to replace the engine control unit as he does…it seems to be nowhere to be found?

Not got any personal experience of ecu problems but my first ports of call would be BBA Reman and AJ6 engineering for advice from posts I’ve read over the years.
Cheers John