fix my Samsung RS21DCNS?

Drinking water line from pump at rear of machine to the front underside panel is blocked. Tried pushing wire down inside pipe but is coming against something solid in line.I have the line split at the front and rear of machine. Is there a join somwhere along this pipe from front to back which might be my problem or could this line be frozen and the problem a buildup of ice? The rest of the line is clear and pump is ok just cant get to or see the remaining length of pipe

exasperated
May 2009