I don't it's explain anywhere in the game. I'm talking about this: Well - tire wear, that I got , but the rest is a mystery. The exclamation point especially I'm really wondering, since it always seems to light up after a lap or two, even if I did not damage the car what-so-ever ?
I haven't tried the game with the new build yet but if you don't shift with extreme caution you'll damage the gearbox in 3 laps (mainly reason I turned off the mech damage in my sp laps)
After some testing, I think I got the issue: The game doesn't handle driving aids properly it turns out. I'm using manual clutch - but I'm only using the clutch pedal for cars that need it (ie, old - H-shifter cars), and in that case, I don't damage the gear-box in-game. And I don't "clutch" for cars that have "build-in" semi-automatic gearbox (ie, GT2 or GT3 cars that have auto-clutch/throttle-cut and auto-blip IRL from the factory) - but the game does not handle it, meaning a dead gearbox after a few laps.
Unfortunately the gearbox is currently very fragile. This is something we will have to tweak in the future.
I had the issue with WTCC when using my seq. with Auto Clutch off, had to turn Auto Clutch on to prevent damage.