We are still using the Insinkerator classic supreme dishwasher that we bought in 1989. Over the past few months, the selector switch started to get a little balky and I would have to press and release the buttons a few times before it would start to cycle. Today it finally bit the dust and I couldn't get it to run. I checked online and a few local appliance parts dealers and cannot find another program selector switch (PN 51311). Any suggestions for locating one would greatly appreciated. The machine still does a great job cleaning the dishes and I would hate to toss it because I can't get a replacement switch. Thanks for your help...