What kind of work with which service !!!!

My real question is, is there a service also the work that the flame protection seals have to be changed from the injection nozzles ??? We have a 6-comb (Bj2009/5) with 185hp and 133000Km down. With our combi the oil-coking was determined and now here one assembly after the other goes into early retirement. At the moment it is the turbo that wave winke made. It is now not so that I hang on to my money but I could with it something more beautiful I hope someone here can help me. Many thanks in advance for your answers. Greetings Barny