I have a 2005 mk4 bew TDI with the original turbo and 200k miles. The car started making high pitch sound under light boost and over 2k rpm. I have removed the egr and anti shutter thinking that it may be a vacuum leak on those but that did not help. I have attached pic of turbo. I don't think the shaft play is bad and I don't see score marks but there is discoloration around the impeller. Could the turbo be bad?]
PS. I can't find a way to attach photos
PS. I can't find a way to attach photos