If, due to any reason attributable to TEC, the Equipment fails to attain the guaranteed performance as specified in Article 13, such test shall be repeated as soon as practicable after the failure. TEC shall advise, with all reasonable speed, adjustments and/or modifications before the repetition of any performance guarantee test. However, the performance guarantee tests shall be completed within three (3) months after the first failure of the performance guarantee test. TEC shall take effective measures at his own expense to attain the guaranteed performance and shall bear all the modification expenses at maximum 10% of the Contract Price excluding opportunity cost of SKK referring to the technical test procedure and the failed guarantee performance test.