After a lengthy battle with Nissan Customer Services, I have decided to post this thread to warn all Micra owners of a manufacturing fault which Nissan are denying. I would bet that most would say there is no corrosion on their vehicle..... Right ? Do yourself a favour, look at the rear of the roof and down into the drainage area before you get to the top of the rear hatch door. I have seen so many Micras affected by this (new and old) and Nissan refuse to accept this. I have pictures to prove it ! I don't have rust anywhere else on the car but it has severely flaked in this groove and is starting to rust in this area. Have a check if you dare .... it might scare the pants off you. I couldn't believe it when I first saw it. Unfortunately, it's not an easy job to get in there to rub down, prepare and spray it. It's barely possible to get a finger in there with the hatch raised, let alone any polish ! That's why so many people miss it. I would be interested to hear of anyone elses experiences. I can provide piccies if required.