Originally Posted by
just another jocky
Yes.
Never heard of his assertion; I'm not sure there was anything you could do with the RB199 to make it perform better at altitude....other than replace it with a better engine.
There were a number of programmes ongoing throughout the life of the engine to improve performance and reliability. Need to get my post count to 10 before I can post pictures/urls as I found some info about this on Flight Global via the 'Wayback Machine'.