1.3 Unithai-Southern Co., Ltd obligations under the Agreement shall be limited to regular maintenance, inspections and general performance observations in accordance with the Scope of Works and Service Conditions and shall not cover repair or replacement of the equipment. Spare parts, materials, consumables and repair of such faulty equipment are not included in the maintenance total price and are subjected to be charged additionally unless otherwise specifically included in the Agreement. Best Trade System shall obtain the prior written approval of the Customer or the Customer Representative hereinafter referred as "Representative" before affecting any repair or replacement work. (Preventive Maintenance)