Amazon.com: i5 2.4 GHz 16GB RAM Logic Board 820-3476-A for Apple MacBook Pro Retina 13" A1502 2013 2014-90 Days Warranty : Electronics
Macbook Pro 13" Retina A1502 Take Apart (2014 Model) - YouTube
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MacBook Pro 13" Retina (Mid 2014) 2.6 GHz Logic Board
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
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macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
How to add more RAM to your MacBook Pro - CNET
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Apple MacBook Pro 13" Retina 3.0 GHz Core i7, 16GB RAM, 512GB SSD 2014 | eBay