Please post the info requested about your taps that leak? If you can't see a name on them, just put up some photos. If you need help posting photos, just ask.
I replaced the cartridge inside part of our Moen for free. Yep, Moen gives a lifetime guarantee and they gave me that cartridge and a little tool needed to help get the old cartridge out. That was at a Home Depot, by the way.
But maybe you have a Moen, and maybe you don't. The person that requested the info is very experienced in things Airstream, and can probably help you with whatever you need to do.