I won’t particularly recommend the workshop at my workplace / dealership because I don’t want to be biased but I am happy to a do a cash trade deal on genuine parts for you. Send me a message if you’re interested Greg
I'm no expert but this is what I found for LN56-QD3 (LN56 0077883) which I think is your model. Showing part (1) should be a prop. valve on a bracket on the diff.