I have a Zavoli dual fuel system in my Discovery 3 V6. The LPG stopped working a few weeks ago but came on again. Now it stopped for good. The delay running on petrol when I start up still works but then won’t switch over to gas (the dreaded beeps).

My local mechanic checked the fuses and relays but can’t read the ECU with his software. Does anyone know someone in the Sydney area who can connect and read the Zavoli ECU to find the problem? It could be as simple as a sensor fault or as bad as a ECU failure.
What else should I check?
BTW, I’m in the Blue Mountains so could also go west to Bathurst for help.

Happy for any advice