See also:

Audio operation precautions
...

Upper tether anchor/key cylinder covers
CAUTION Never force the covers into place because the hinge pins can be damaged. Follow the removal and installation instructions to prevent inoperability of the covers. ...

Air pollution
Industrial pollution, the presence of salt in the air in coastal areas, or heavy road salt use accelerates the corrosion process. Road salt also accelerates the disintegration of paint surfaces. ...