I haven't had mine apart to say for sure, but I doubt that you have a faucet with washers. More than likely you have a cartridge-type valve that you replace. There may be an "O" ring or two to replace as well. Some faucets (Delta type) require that the top housing nut be tightened enough to prevent leaking from beneath the handle. Too tight and you won't be able to move the faucet handle at all. This requires a small spanner wrench that comes with rebuild kits for these types of faucets, but these are the older styles that have been going away due to the newer cartridge designs, although the faucet in my 2012 AI looks like the Delta type from the outside.
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