I just had to have the "nuts" that hold the trunk latch on mig welded back onto the trunk. It seems they had actually pulled out of the trunk's sheet metal! I would suggest anyone with at least 200000 km on their car to check theirs to ensure it's not doing the same thing. It cost me $40 to have this done, and I hope no one else has the misfortune of watching their trunk lid bounce around as they drive down the street.