I run at full damage and I cannot seem to repair engine or transmission damage at all. There is only presets for front and back aero, which I have set as "fix", but even they are greyed out when I enter pits. How do I fix damage?
You need quite a lot of aero damage in order to be able to repair it. If you are only slightly damaged, the buttons are still greyed out. Everything else can't be repaired in the pits.