Defective defrost bimetal that is part of the wiring harness on a KitchenAid refrigerator .

We have a customer with a Model# KURG24RWBS Serial# EK31901299 that has a defective defrost bimetal that is part of the wiring harness part number W10299078. The fine Whirlpool corporation has no eta on this part as they currently have no vendor we believe the refrigerator may have been made by panasonic. The unit is only a year and a half old and Whirlpool is not willing to help the customer in any way. There are no temperature ratings on the bimetal at all just some markings PW-5M2R 4033 R4 which if I play around on google appears it may have been made by SENASYS. Any help would be greatly appreciated