I'm a new member and I come here because I've heard good things about this place and it's members. I'm primarily a collector of coin-operated video arcade games but I finally scored a Jukebox for my basement arcade:

It's a Wurlitzer Statesman 3400 and I paid $100 for it.
I'm completely new to Jukeboxes but have repaired arcade boards, amps, PSUs, monitors, etc., thanks to the help of my fellow KLOVers over at the Vintage Arcade Preservation Society's forums, so I'm pretty confident I can get this going with the right knowledge / help.
The power cord was all kinds of rotted so I replaced it and plugged the juke in to see where I was starting from. It looked like this:

Pretty right?
I make a selection and the bottom-half of the carousel rotates, it stops, and the selected buttons pop back out again. Several more tries and the same occurs:

(This part)
The top of the carousel never spins.
EDIT: I tried geezer49's suggestion from here:
http://forums.arcade-museum.com/showthread.php?t=161088
...this issue still persists.
The turntable drive belt was all rotted away but there where two spares randomly laying in the bottom of the cab so I replaced it with the better of the two and if I manually pull the turntable lever to the left, it does spin but it seems slower than 45rpm?
Here is a view from the top:

From what I have read online, the amp is a 550?:

If anything in the amp is bad, would that cause any of these failures? I assume most of the operations are handled by the "junction box"? I plan on doing a cap kit for it either way.
For sure, I am missing at least:
*The six screws that hold the middle back panel on the back of the cabinet
*The needle
I just ordered an original service manual so that should help a lot, but I was wondering if anyone had any suggestions on where to start or what to try to get this machine working?