Hello, We have a 2009 CE200 bus that after you drive for 20 minutes go to low power but no codes. Turbo actuator failed test, replaced turbo ass. no luck, sent the shop they said EGR and new injectors, no luck so I have it back. while test driving for 20 minutes it feels like you loose boost, it will downshift to try and maintain 60 mph but slowly falls to 35-45, slow to take off. I have take the DOC and DPF off and cleaned. All I have is OTC HD Reader to work with, But no Codes to check. Any Ideas would be helpful.