Here is how I was able to resolve the issue.
def runAction(self, event):
dropDown = self.getSibling("Dropdown").props.value
if dropDown == 7:
viewPath= "Page/Refrigeration/ChillReport7"
elif dropDown == '7A':
viewPath= "Page/Refrigeration/ChillReport7A"
else:
viewPath = "Page/Refrigeration/ChillReport"
system.perspective.openPopup(id="ChillReport", view = viewPath)