Originally Posted by
IFixPlanes
The box in red indicates a past redline exceedance.
Correct, there was an exceedance but it is no longer over limit.
Had the exact same situation a couple of weeks ago with an EGT exceedance during a full thrust takeoff. During the exceedance, the entire circle of the associated EGT was red(and probably the numbers as well with a red box but I am not sure for that part). Once back within limits, the circle is no longer red but there is a red box. This red box is not always in view. It can be cancelled and recalled by pressing the recall/cancel switch. Once cancelled, it comes into view only when the recall switch has been selected and is displayed along with the recall items.