I hope you guys were able to figure it out. I just did a little search of error 28 and got this from the apple site:
Error 23, 28, 29, 1002, 1011, 1012, 1013, 1014, 1611: These errors may indicate a hardware issue with your device. Follow the steps in this article and also attempt to restore while connected with a known-good 30-pin Dock Connector cable, computer, and network to isolate this issue to the device. If the MAC address is missing or the IMEI is the default value (00 499901 064000 0), this can also confirm a hardware issue.