iFixit tears the 2013 Mac Pro asunder, finds an actually repairable Mac | Ars Technica
MacBook Pro 13" Retina 2.4GHz Logic Board, 4GB, Late 2013 - 661-8144
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MacBook Pro 13" Retina Display Late 2013 Logic Board Replacement - iFixit Repair Guide
MacBook Pro 13" A1502 Late 2013 ME864LL/A i7 2.8GHz 16GB Logic Board 661-8150
MacBook Pro 13" Retina 2.6GHz Logic Board, Early 2013 - 661-7346
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MacBook Pro 15 A1398 Late 2013 Logic Board / Motherboard 2.6Ghz i7 16GB 661-8309 | eBay