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Logically ,you work forward from the bleeders and slacken every union/connection until you find the first one that weeps brake fluid. Then start purging until you get clean fluid coming through.
It would be much easier to assume corrosion in the nipples and remove one completely and inspect.
I'd guess that the union on the caliper will weep if you slacken it? In which case it is almost certainly corrosion in the nipple.
Unless someone fitted Automatic Bleed Valves?
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