Mmmm ....
.....
I heard was the engine was at 950 degrees C for 1 minute. .....
Now in the 139 that is pretty hard to do unless you work at it .... perhaps 'someone' inadvertantly flipped an engine into 'manual' ... THAT CAN be done pretty easily especially when your new to the type ... and by the time you work out what has caused it ????? .....
Be kind chaps ... be kind!