I have a Giant Roam 3 2012 and a cap on top of the fork (not sure what it is called) has cracked and popped off. Please see attached picture.

My questions:
1: What is the name of the part?
2: Where can I find the replacement part?
3: Can I easily replace the component myself or should I just take it to the shop?

Thanks for the help.

Top cap, control cap, preload adjuster, etc... I don't know enough about suspension forks, but it seems the location and function of the control caps is not the same across the board.

Take a look at your fork and see if you can find the name and model number. It may be an SR Suntour, but you'll want the model number. From there, search for a schematic online where you can identify the small part number.

Or drop in at the local Giant dealer.