I had same issue bubbling on front lip bonnet and various other spots….took the car in dealer took a load of pics and said there is a definite problem that could not be denied . However they then asked for the service log book , the dealer opened it and almost immediatly shook his head and said this is going to be a problem,…previous owner had had a non nissan service twice about two years ago. This some how turns out it voids the warranty due to anti corrosion checks they make at time of service. Personally i think its a load of BS! If anyone has had same issue and had success at another garage would be good to hear.