Robin, the red box indicates that you exceeded N1% for that particular engine. I'm guessing the sudden onset of severe xwinds caused the AT to power up and that's what caused the issue.
Now I'm not sure particularly on how the B777 works or how PMDG model their B777, but I'm sure the red box has to be reset on the ground by an engineer and the engine has had to exceed N1% for the minimum of 5 minutes?