Using the remote, configure the receiver settings again (disque 1 etc)...First reboot the receiver wity BACK of receiver,power off,wait 2 minutes, power on,turn to channel 300...now see if U got E6/8 back...if not reconfigure the receiver..
I'm presumming your 3 receivers are all coming from the exterior disque switch, so LNB's etc should all be aligned etc and hardware outside good..
I just tried to reboot and change the disqe from 1-2 and nothing still on 6-8, but 7 still works. If i check the signal on the 6-8 chanel it is pretty strong, but no picture, it keeps saying scrambled chanel.