Showtime has all the good info. If you had previously had the tech change the v-codes in the shaw system for your southern receiver, then you should take it to a friend's house with the Xku lnb. Hook it up and then call or online do a rehit. You have to be on a working channel so the new info can be sent from Shaw. And I agree with Showtime that the 4378 code only will be in place in a short while. Try some of the channel numbers he suggested to get a signal at the friend's house.
This would be the quickest way for you to get on track. There are other ways, but more time consuming.
Catamount
This would be the quickest way for you to get on track. There are other ways, but more time consuming.
Catamount