Does the retailer have a right to charge the comsumer a fee for warrantied merchandise if the manufacture was sold to another company?

The answer is "it depends." You do not provide enough information from which this question may be answered. As a general matter, a manufacturer may charge whatever it wants, unless it has agreed not to do so. In this case, if the seller of the parts is not the warrantor of the product, the seller may do as it pleases. More information is required to provide a definitive answer.