Open button (r-1875-t)
The sharp part number is jbtn-b636wrfz this is a genuine sharp part, not aftermarket.
SHAJBTN-B053MRF0, SHAJBTN-B111MRF0, SHAJBTN-B111MRF0A, SHAJBTN-B636WRFZ, JBTNB053MRF0, JBTNB111MRF0, JBTNB111MRF0A, JBTNB636WRFZ, JBTN-B111MRF0, JBTN-B111MRF0A, JBTN-B636WRFZ, SHAJBTNB053MRF0