I'm getting a 2614 misfeed error when trying to duplex from a pf740 tray 4 only. I can duplex from tray 3 all day. I can so simplex copies from tray 4 all day. Just having the jam code from tray 4 when duplexing. I spoke with kyocera tech support and they said to try a couple of sensors which didn't fix the issue. I called tech support back and they said to replace pf740 main pwb. Anybody have a similar issue.