Panasonic NN9859

Question

HII have one unit Panasonic NN 9859 also and now the membranepanel is not working. i have sent to Panasonic service centre and theycant find replacement parts of the membrane switch as it is no longerin production. I have searched through the internet and found the partnumber to be A630Y5460HQP for NN 9859 but the service centre say thepart number should be A630Y5820HQP which I found to be for the NN 9850model.Can some one please confirm whether the part number is correct before I place an order from Australia? Thanks very much.