Perhaps even a place that fixes electrical stuff like touch screens could do this - I have books on microwave repair, the repair person should be able to easily read even on forums how to safely discharge the electricity in the microwave before working on it, and I would unplug it for all time now until you take it in, though microwaves can store electricity for a long time. It may be you don't need a great vintage microwave person (though I would try to find one) for a repair like that - fix it shops that work on cell phones, other electronic items may be able to fix the touchscreen - when you watch video's on repair people repairing "unfixable" tv's and stuff - often the problem is a circuit trace, capacitor, bad solder, things that can easily be fixed with a little know how and observation. I am still looking for a vintage Amana Radarange familiar repairperson in San Diego, CA area to check over my RR3 I bought, service it a bit, and replace a light bulb socket -I wrote earlier that I have no electronic repair skills and yes, I became aware of the resistor long ago & realize one could kill oneself. I did replace a fuse years back which went well. I do believe this problem is the touch pad since I can set the clock but little else. I've been hoping that there was a talented person, in my vicinity, who tackled repair on vintage appliances.