This excerpt taken from the PCG 10-K filed Feb 18, 2005.
22.214.171.124. Amendments Proposed by the ISO
The ISO shall periodically review each PTO's Maintenance Practices having regard to the ISO Maintenance Standards, as amended and revised from time to time pursuant to Sections 7 and 8 of this Appendix C. Following such a review, and after considering the Section 348 Criteria, the ISO may recommend an amendment of PTO Maintenance Practices, by means of a notice delivered in accordance with Section 26.1 of the Transmission Control Agreement. The disposition of any such recommendation shall be in accordance with 5.3.3 of this Appendix C. Except as provided in Section 126.96.36.199 of this Appendix, the effective date shall be no earlier than 30 days from the date of such notice.