https://wccftech.com/iphone-12-mini-service-possible-without-replacing-entire-device/

Oftentimes, when an iPhone needed to be serviced, Apple’s technicians would thoroughly inspect the model in question and decide if that specific part or the entire unit would needed replacement. However, with the iPhone 12 and iPhone 12 mini, these technicians will soon be able to service more parts without requiring the need to replace the entire device.

An internal memo was obtained by MacRumors, in which Apple’s repair technicians were authorized a new method to repair iPhone 12 and iPhone 12 mini parts without needing to replace the entire model, a solution that was already costly for the company. A new ‘iPhone Rear System’ part shall be available to authorized personnel. This part will comprise of a rear enclosure of an iPhone with all components present except for the display and rear camera.