The repairs should still be covered by a 12 month / 12K warranty. Unfortunately, Ford would probably tell you the problem is unrelated to the repair. Your code and symptoms are the same ones I had when my o-rings needed to be replaced. They may not have gotten the o-rings in properly the first time. Or, they may not have even replaced them if you didn't have a problem at the time even though the instructions say to replace them. I can see an unscrupulous dealer doing that to save time. I've seen worse from a dealer. A guy at work wrecked his '98 Sport a couple of months after he bought it new. On the bill to the insurance company he noticed that the dealer charged for 2 front tires and rims, size 235 75R15. Well his Explorer has 16" tires and he knows for a fact they never replaced his rims. He still has the scratches from the accident. It amounted to about $800 that the dealer charged his insurance company, even though they didn't replace the items.