1. If it's under warranty it's free. If it's not then it'll be somewhere around $40 or free if you say the right things.
2. It'll take about a week and a half from when you send it to when you get it back.
you might try talking to your local pb shop. mine went out and I talked to them about sending it in for me and b/c it was from a shop they didn't ask any questions about it just sent a new one. all I did was pay for shipping