Many years ago I investigated a problem with 777 display of engine limits. I was eventually given data from one of the early flight test aircraft that explained the problem and I reported my findings. I don't think the problem was ever fixed.
Basic problem was that EEC was required to provide limits data to AIMS. Because of a system level requirements defect EEC stopped sending the data before AIMS was ready to receive it. It I remember correctly re-powering the aircraft did not fix the problem because every power up had the same timing and AIMS could not receive the required data.
I think the solution was to delay EEC power up until after AIMS power up was complete. There was an alternative work-around but I don't remember any details. I think it required some action on the MAT.