I'm a slow learner :-(

In my defense, I did get it working back in 2011. And I again solved the problem when the second 722 had to be replaced in December 2019. In fact, after I had discovered the magic sequence this time, I dug out my notes from 2011 and saw that I had come to the same solution then. My memory has declined in recent years, but my problem solving skills have improved to compensate :-)

BTW, am I the only one who thinks it's strange that one must first change the TV1 address to some unwanted address and then change it back to the the wanted ?address?