IMHO, these components are so cheap that I would
1) re-seat the cables
2) if that didn't work, exchange it under warranty
3) if it's not under warranty, buy a new one. It should be swappable, like this example: http://www.ebay.com/itm/like/272338613024?lpid=82&chn=ps&ul_noapp=true
Well, I would pull out the spare in my parts drawer, but not everyone has a parts drawer.
IMHO, these components are so cheap that I would
1) re-seat the cables
2) if that didn't work, exchange it under warranty
3) if it's not under warranty, buy a new one. It should be swappable, like this example: http://www.ebay.com/itm/like/272338613024?lpid=82&chn=ps&ul_noapp=true
Well, I would pull out the spare in my parts drawer, but not everyone has a parts drawer.