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Restored Apple A1398 MC975LL/A 15.4" MacBook Pro, Mac OS X 10.11 El Capitan, Intel Core i7-3615QM Processor, 16GB RAM, 256GB Solid State Drive (Refurbished) - Walmart.com
15" 15 Inch Retina MacBook Pro A1398 Mid 2015 Complete Disassembly (Almost) SSD Upgrade - YouTube
MacBook Pro 15” Retina A1398: How to Upgrade SSD or Replace Faulty One - YouTube