code: public void uncheckCheckboxInCell(int row, int column) {
          String checkboxLocator = getXPathBase() + "tr[" + row + "]/td[" + column + "]/input";
          CheckBox cb = new CheckBox(checkboxLocator);
          cb.uncheck();
      }
docs: Untick a checkbox in a cell of a table indicated by the input row and column indices.
  
  @param row
  int number of row for cell
  @param column
  int number of column for cell