Costco Concierge (after 4 hours on the phone) finally sent out a technician to replace teh power supply board, the motherboard, and the speakers. The popping/cracking sound is perhaps worse than before.
I don't see any screws to loosen. The technician showed me a custom tool they use to snap off the back of the enclosure.
I've been waiting a week to find out what are the next steps.
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