Turned my MacBook Pro 15' 2015 back to brand new for just $240 USD. Upgraded SSD to 2TB. New Apple OEM Battery installed. Thermal paste replaced. Fans including all internals cleaned. : r/macbook
MacBook Pro 13" and 15" Retina (2015) SSD
How to Upgrade the SSD in a 2015 MacBook Pro 15" - Bigger! Better! - YouTube
Sostituzione SSD MacBook Pro 15" Retina Display versione metà 2015 - Guida di riparazione iFixit