Are there any time limitations or other qualifiers mentioned in this passage regarding when Parliament can modify conditions of service?
Yes, there are time limitations and other qualifiers mentioned in this passage regarding when Parliament can modify conditions of service. According to the text, after a person is appointed to a certain post (Chief Justice or other Judge of the Supreme Court or a High Court, Comptroller and Auditor-General of India, Chairman or other member of the Union or a State Public Service Commission or the Chief Election Commissioner), Parliament cannot vary or revoke their conditions of service to their disadvantage except in so far as such conditions are applicable to them by reason of their being a person appointed by the Secretary of State or Secretary of State in Council to a civil service of the Crown in India.