I opened the MP3 player to find out the Board ID, which s1mp3.org says is critical to upgrade the firmware (because I believed my MP3 players problem to be software related). When I opened the MP3 player a small metal cylinder in a black plastic coating fell out. The black plastic coating appears to have three characters written on it. The first character on the coating is not clearly written, it may say "S", "5" or "3". The second and third characters are either O's or zeros. I believe I could solder the component back on to its connections, but for the life of me I can't find where it broke off of. I'm including an image of the interior of the player hoping someone will know what the component is and have an idea of where it is supposed to go. The cylinder itself is app. 6 millimeters long, app. 1.5 millimeters in diameter, with two connections coming out of the end of it.

In addition to finding out that the hardware is broken, I haven't been able to confirm what the Board ID is. U-MP3-A 2004 04 07 is written on one of the chips, but after searching the net I haven't been able to find any confirmation of that being an s1mp3 Board ID.
I would greatly appreciate any information that may answer the questions below:
1. What is the broken part?
2. Where does it go?
3. What is the Board ID?
P.S. As you may notice from the picture, the headphone jack is not there. That is because its soldering connections have broken. Something else I'll need to fix.