Thanks for that Lifttrainer. I've had another two techs out to looks at it, the first one said it was a sticky contactor and wanted to charge me $2015 + tax to replace it. The second guy actually looked up the fault codes and diagnosed the same as you, over current in the lift amp. he also tested the contactor and found it was functioning as it should.
It's Friday morning here, the weekend is upon us, so my day is only getting better from here!