Sharp carosel micro wave Model R-9h54

Question

Dear Sirs, I purchased a Sharp Carousel Convection Oven. Model R-9h54.
Power output 850 w Serial no: 930701206 (Made in Japan) around 1986
The unit has served me well for over 20 years and I hope it can serve me for another 20 years. I have a problem with the touch pad assembly could you supply me with this touch pad unit. I am quite capable of replacing defective part myself.
I have resided in the Philippines for the last 15 years but I am unable to locate the spare parts here in the Philippines. Sharp Philippines are unable to locate this part. The unit is still like new so I don't want to go to the expense of purchasing a new unit.