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Please could you help with the part number that I need for a replacement logic board for my iMac 27-Inch “Late 2015, Retina 5K” with a serial number of C02R22WAGG7L Thanks.

By your serial number you have a Apple iMac “Core i5” 3.2 27" Retina 5K, Late 2015 - MK462LL/A* - iMac 17,1 A1419 - 2834. The logic board for your computer would be a 3.2 GHz Core i5 (I5-6500) Apple part number is 661-03169 Additional logic boards for this model are 4.0 GHz Core i7 (I7-6700K) 3.3 GHz Core i5 (I5-6600)