Are there any specific roles or positions mentioned in this passage that are exempt from the power of Parliament to modify conditions of service?
Yes, there are specific roles or positions mentioned in this passage that are exempt from the power of Parliament to modify conditions of service. These include:

1. The Chief Justice or other Judge of the Supreme Court or a High Court
2. The Comptroller and Auditor-General of India
3. The Chairman or other member of the Union or a State Public Service Commission
4. The Chief Election Commissioner