Fix the constant shift issue On my Macbook Air A1466 the shift key seems to be constantly pressed, even during boot so it only boots into safe mode because of this.

The issue exists both before and after replacing the keyboard with a brand new one!

This is what I've tried:


Reinstalled MacOS
Replaced the whole keyboard (painful process)
Reset NVRAM (alt + cmd + p + r) during startup
Hooked up an external keyboard (this one works fine, but shift is still held down)
Tried Keyremapper: https://pqrs.org/osx/karabiner/ which helps WITHIN the OS, but not during boot 


Any ideas?

PS: This is not a duplicate of Shift key damaged how to disable it at boot?. There it's simply a keyboard hardware issue, which is not the case here since the keyboard has been replaced.
The issue was fixed after replacing the trackpad module.