The Trustee shall be entitled to payment and/or reimbursement for reasonable fees for its Ordinary Services rendered hereunder and all advances, Counsel fees, costs and expenses and other Ordinary Expenses reasonably and necessarily made or incurred by the Trustee in connection with such Ordinary Services and, if it should become necessary that the Trustee perform Extraordinary Services, it shall be entitled to reasonable extra compensation therefor, and to reimbursement for reasonable and necessary Extraordinary Expenses in connection therewith; provided, that if such Extraordinary Services or Extraordinary Expenses are occasioned by its gross negligence or willful misconduct, it shall not be entitled to compensation or reimbursement therefor. Upon the occurrence of an event of default, but only upon such occurrence, the Trustee shall have a first lien on the Trust Estate with right of payment prior to payment of the principal of and interest on any Bond for the foregoing advances, fees, costs and expenses incurred.