[greenman]

It might be, could I take the stereo and find out or is there an easier to remove the obstruction.

Pulling the radio out won't help unless you want to take the radio itself apart. That is probably possible but an easier way may be getting a very strong vacuum over the jack. Really depends what's been jammed in there. If it's the tip of a male jack I can think of another possible thing to try but try the vacuum first. Gonna have to be a very strong vacuum.