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I left it alone until command electronics reopened and I was able to purchase replacement LED wafers. Surprisingly it unscrewed easily. My “attic” is pretty warm now with the spring sun beating down on it so I guess the metal housing expanded.
I ended up replacing three on the same circuit. The two adjacent to the bad one began strobing while I was procrastinating and I thought it was the Christmas tree light effect but they kept strobing after I replaced the original defective wafer. Not sure if the bad one caused the others to fail or if it was a coincidence. I’ve got a few more giving trouble intermittently now. I thought these LEDs were good for ten years. Guess I was wrong.
Thanks for all the suggestions,
Phil
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