I think you are right about the frost heave, ground gets saturated by the leak, that will heave quite a bit.
Looking at the diagram, considering what you have said, its hard to figure, with the branch lines and or whole system being buried.
This has seemed to exceeded its service life, maybe the rust hole was a material defect, or part of the conditions there, or there could be more of them, but without having it all exposed, you won't likely know and I am sure you don't want to hear about installing a new line.
Obviously static testing through low pressurization due to age( should be 1 1/2 x operating pressure of the pipe) is going to show a leak, or leaks, but where and how many, you can't isolate any of it if its buried, maybe you could at the repair that was exposed ? Not much help, these can be a real pain, I've dealt with enough of it at our stable in the past, even installed new lines, at that point at least any trouble besides freezing is at the ends where you can deal with it.
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