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After another T5 Torx screw is removed, the 64GB flash storage board can be disconnected from the logic board. It would be easily user-replaceable if you disregard the strange 5-point Torx needed to get inside.
The Mini PCI Express form factor SSD drive is a completely custom part, and will probably only be available through Apple support services, thereby putting another nail in the coffin for user-serviceability.
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