Application may be made to the Commission at any time by a holder of a certificate for amendment or modification of the certificate, or for the suspension of a provision of this chapter, or of another regulation affecting the holder, either generally or in a specific case. The application shall be made by formal petition under Chapter 5 (relating to formal proceedings) and the Commission will, after due notice, if it considers the action desirable, schedule the petition for hearing. Applications for amendment or modification of a certificate of public convenience shall be accompanied by the filing fee of $10.
52 Pa. Code § 27.7