Pay and discharge promptly when due all material taxes, assessments and governmental charges or levies imposed upon it or upon its income or profits or in respect of its Property before the same shall become delinquent or in default, as well as all lawful material claims for labor, materials and supplies or otherwise, which, if unpaid, might give rise to Liens upon such Property or any part thereof, unless being diligently contested in good faith by appropriate proceedings and as to which adequate reserves in an amount not less than the aggregate amount secured by such Liens have been established in accordance with GAAP; provided , however , that such contested amounts giving rise to such Liens shall be promptly paid upon commencement of any procedure or proceeding to foreclose any of such Liens unless the same shall be validly stayed by a court of competent jurisdiction or a surety bond, which is satisfactory in all respects to the Technical Agent and is delivered to the Administrative Agent in an amount no less than such contested amounts.