I am going to take a guess and say that it's broken. I just bumped mine the other week with my elbow and now it doesn't open or stay up on its own, though it is still attached.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |