Hi,
Try the following from your PSC
usr/lib/vmware-vmdir/bin/vdcrepadmin -f showservers -h localhost -u administrator -w <password>
/usr/lib/vmware-vmdir/bin/vdcrepadmin -f showpartners -h localhost -u administrator -w <password>
/usr/lib/vmware-vmdir/bin/vdcrepadmin -f showpartnerstatus -h localhost -u administrator -w <password>
That should display your PSC replications and from that you will know that each vCenter connected to one of the PSC's will automatically be in Enhanced Linked Mode
Chris