Sprinter CDI injectors broken?

Sprinter 208CDI injectors broken? Help! for Sprinter 208 CDI Built. 2001 The engine has run 115 000 km, is always well maintained and has been jogging for 3 weeks, completely without additional diesel consumption and it still does well. The Bosch service can find nothing and wants to install (probably out of desperation) new injectors. Does anyone know the problem? Measurements revealed compression, which by clean and clean, new incandescent pins and the installation of a n I’m really desperate. Can someone give me a tip what my sprinter has? It can’t be a unique phenomenon?! I’m really in need and would be very grateful for help! Best regards Wundy