No, but for parts that are self-made, the repairer bears the manufacturer’s responsibility. Hence, the repairer must know the safety requirements and be sure that the result fulfills safety requirements.
It might seem strange, but it may not be allowed to repair the product to same condition that it was before breaking. Also, if the equipment has any warranty remaining, the manufacturer might refuse compensation if it can be suspected that further breaking was even partially due to self-made alterations.