Following those couple of intense days of Melbourne heat a week or two back, the large majority of the leaves are looking worryingly dry and near-death, though a small portion of the leaves have retained full greenness on segments of the leaf only. A handful of dried leaves have fallen off. The smaller branches have now lost that redness. I thought it was weather-related decline, but now it appears the result of a gas leak.
We identified a leak in the gas box/pipe, which is in the corner of the yard. The same corner as the Gungurru and our now-dead Pittosporum tree (not sure of the variety) which died last year. We're having a plumber visit to look at the leak later today, but I wonder if there's any way to save the dying tree? We're so fond of this tree and wanted to see if there was anything to do to save it - I'm kind of assuming not.

Also - bit of a tangent, but if a leak is identified, is there any onus on the gas company to address it/compensate us?
Thanks for reading.