C774 services for walking and resource (cyclic) testing of the spinton frame of the wagon wheel 81-717; 81-714 and their modifications (chart No. 2.7170.31.20.017.20SB and its modifications) with expiry of previously extended service period for determining the residual resource (residual durability) and the possibility of re-establishment of the new designated service period for spinton frame wheels (chart No. 2.7170.31.20.017.20SB and their modifications) with expiry of previously preliminary s