I once had this last year when it was very cold, and the button was frozen in, leading to me being unable to shut the bootlid for a journey, but it did eventually pop out as soon as the car thawed out.
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Ex Owner of 2000 Phase 3 306 GTi 6 China Blue - You shall be missed1974 Triumph Stag
1989 Peugeot 205 GTi 1.6
2003 Alfa Romeo 147 JTD Lusso
2005 Mondeo Ghia X 3.0 Estate LPG