Hi @chipmaster
According to this [https://www.partselect.com/Models/JTP86CF7CC/Sections/MICROWAVE-CONTROL-PANEL/?ModelID=387123&ModelNum=JTP86CF7CC&mfgModelNum=&ManufactureID=2&Selected=00125986i01&Position=5&mfg=GE&Type=Microwave-Oven-Combo&Mark=5|website] the ''manufacturer’s'' part number for the Microwave control is ''WB27T10463. (''part #16 Microwave Control Panel parts diagram) Click on 2nd part #16 in the parts list to view the manufacturer’s part number as it is different to the supplier’s (PS) part number)
If you search online using the part number ''only'' you will get [https://www.ebay.com/p/1022360204|suppliers] (example only to show the part and the cost of the part). There are other suppliers that may suit you better.