Service Agent recommendation for Engel fridge

[Plasnart]

I have an old banger 29L Engel that cools down to -11 degC without effort but has just this weekend dropped its bundle on 12V and stopped cooling. It was circa 33 Deg C all weekend but my 60L Engel handled it fine. The 29L engel dragged the second battery down below 10 V then stopped running - like it should. I am suspecting the motor/pump on the 12V side is faulty. Can anyone recommend a reputable service agent in the SE suburbs of Melb I can take it to and get a fair dinkum honest appraisal/repairs done?

When you find him he'll be sitting at his desk covered in cobwebs, meanwhile the Waeco repair man next door pulls up in his Porche!