Dvd trays out of time

I have a panasonic sc-ht680 5 disk am/fm home theater, the problem is that my daughter forced the trays in and threw them out of time. Now all the trays dont eject fully to remove the disk and I think one of the gears slipped time to cause this problem. I see no damage to any of the internal working of the mechanism. Any help with gear location to tray location timing would be greatly appreciated. Thanks