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It's easily opened, but beware of the cable to the four connections of the power cover add-on as that goes between main PCB (mounted on screen panel) and a small pcb on the rear cover. Not glued.
It's probably lacquered to make it "waterproof".
It could be a faulty BGA solder joint (very specialist) or defective IC or ribbon cable issue. I'd avoid it unless it's free and delivered free.
You can probably replace the battery on a Sage (eventually) and do nothing else.
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