After about 3.5 years of use, our DC14 developed a crack in the ducting just above the valve pipe. It seems the action of changing the head's angle was stressing that part, and the crack quickly became a full-on break. As far as I can tell, the broken piece is part of the duct assembly and is not individually replaceable. Since my wife isn't happy with her DC33 replacement, and since a new duct assembly was only $43 shipped on Amazon, I decided to try replacing it.
There are a number of written and video guides describing changing the motor, but are there any describing changing the duct assembly? Since this is the heart of the unit, I'm guessing the procedure is to completely disassemble the unit and then reconnect the parts to the new duct assembly. I'd love to hear if anyone out there has attempted this and has any documentation.