Chosen Solution
The right side USB port in my early 2013 MacBook Pro hasn’t functioned in years. Is there a replacement part and a guide for this repair?
Yep, there is a part to replace. Although, I’m not 100% sure if this will fix your issue or not… Part —> MacBook Pro 15" Retina (Mid 2012-Early 2013) Right I/O Board Guide —> MacBook Pro 15" Retina Display Early 2013 I/O Board Replacement