I have a Hampton bay brookedale II ceiling fan. Three of the six lights on the top fixture are not working. I have replaced all bulbs but they still don't work. All else is fine. Any recommendations?

Unmount the light kit and check the connection of the wires from the fan to the kit. You could find a bundle of whites in one wire nut and a bundle of blues with another wire nut. Make sure all wires are well twisted clockwise before reinstalling the wire nuts.