I'd like to welcome you to the forums and say that I'm sorry to hear that you've been having an issue with the 7402 error on your TiVo®
Apologies for the delay in getting to your post.
I can see that a technician did indeed call out for you, and the issue has now been resolved. So apologies again that I did not get to this post sooner.
The error can be caused when a signal sent to the TiVo® has not been received correctly, the majority of the time, we are able to resolve this by resending the signal, but it seems to be that in your case this was not possible.
Should you still be having any issues with your TiVo® please let me know so that I can look into things further for you.