My left tailgate hing seems to be worn out after 19500 miles. Having trouble getting things to line up an close properly to latch. Has about 3/8" side to side play. Never was like this before. Truck is 2005 CC. Has anyone else had this issue? Is it covered under the 3 year / 36000 mile warranty - or am I buying a new hing and chaging it out. How much are these hinges and how dificult are they to change? Thanks!