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Apple’s MacBook Pro memory problem is worse than ever
(www.macworld.com)
This is a most excellent place for technology news and articles.
Yes. There is no internal upgradable parts. I believe you can only replace the battery cells, the fans, and the mainboard (motherboard with soldered CPU/RAM(VRAM)/SSD, and all connected modules like the USB chipsets, audio chipset, etc.).
Replacing the motherboard triggers the screen drm and the screen gets all fucked up and won't go to sleep.