(5) The Commission may request the dominant telecommunications service provider to prove that its interconnection charges are based on actual cost and, where necessary request an adjustment of the charges or impose default interconnection charges in the event the proposed adjustment is not implemented by the dominant telecommunications service provider. (6) A dominant service provider shall— (a) notify the Commission in writing of any proposal to change interconnection charges in the form and manner as prescribed by the Commission from time to time; (b) sufficiently unbundle charges for interconnection, so that the telecommunications licensee requesting the interconnection is not required to pay for any item that is not related to the service requested; (c) maintain a cost accounting system that— (i) complies with the cost accounting guidelines that may be published by the Commission from time to time; (ii) demonstrates that its charges for interconnection have been fairly and properly calculated; (d) avail to the Commission, on request, a description of its cost accounting system showing the main categories under which costs are grouped and the guidelines for allocation of costs to interconnection and the Commission’s, or any other competent body; regulations or guidelines have been adhered to. (7) A dominant telecommunications service provider shall promptly, on request supply financial information to the Commission to the level of detail specified by the Commission. (8) The Commission shall upon satisfying that the dominant telecommunications service provider has fully complied with these regulations together with any other guidelines that it may have prescribed, publish a compliance report. (9) In addition, the Commission while taking account of considerations of commercial confidentiality may publish such financial information in order to