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I don't think I've ever seen one overcome a branch, that gets plenty of sun, dying back. And they don't do a good job at all of filling in with new branches where bare spots are.

Likely sap. Wood peckers might be one cause, also dripping pine cones over time, wind damaged branches, old wounds can ooze for a long time. Maybe boring insects. Fun fact: you can collect the white dry sap to use as incense when placed on hot charcoal.