If the board is original it would be soldered in.

If it is plugged in you should be able to see it sitting in a socket.  If its soldered the pins will be clearly seen as having solder where they meet the board.

If it is soldered in you will need to desolder it and then it is best to fit a socket so that it is easy to remove if it ever needs replacement again.  The 22 pin sockets are available at Jaycar.

Hope this helps.