Ok looked at syslog and I'm getting this on the server
Sep 13 10:53:06 PXEPI rpc.mountd: authenticated mount request from 10.0.0.134:803 for /tftpboot/er/shares/bodhi/i386 (/tftpboot/er/shares)
Sep 13 10:53:06 PXEPI rpc.mountd: refused unmount request from 10.0.0.134 for /cdrom (/): not exported
it's looking in the right place but it looks like the bodhi kernel is looking for something that isn't there.
Edit: after a bit of digging my suspision is that it is a kernel issue with Bodhi. I've seen similar issues in Arch and the issue for them was the nfs module compiled with the newer kernel. for some reason it isn't talking to nfsv4. Can anyone verify this?