Mad, I beg to differ. So called 'Firewalling' modern jet engines will not 'trash' them nor even damage them. A jet engine cannot produce more power then it was designed to produce, that being its MAX Thrust. It can produce more power then it is rated to produce if the throttles are pushed fully forward. It is an urban myth that an engine will need to be changed after such action. If CFM/Boeing thought that such an action would 'trash' their engine then they would not refer to it in the QRH as being allowable in extreme conditions. Provided the engine is not kept at max power longer than the allowed time, normally 5 to 15 minutes, it will be perfectly usable in the future. It might be subjected to some examination but it will most certainly not be 'trashed'.