Trouble after moving DVR to another room - code 782

Due to construction in my house, I moved the HR54 DVR to the spare bedroom. I received a Satellite Connection error message, code 782. I won’t spend any time describing the failed attempt by Tech Support to help - basically it came down to living without DTV during the 2 week construction because the DVR will only work where it was installed. 
Reading another post in this forum, someone advised making sure I move the bedroom cable on the splitter to the “red circle out” port of the cable splitter. I rebooted the DVR and all is well. When the construction is done and I move the DVR back to its original location in the family room, I’ll need to move the family room cable to the splitter’s “red circle out” port. 
Tech Support needs to have this information available to customers who know how to unscrew a cable!!