As part of my job I follow all complaints/critiques/opinions about miners and take it into account when purchasing. The T9 complaints I have seen all fall under the category of user error and not hardware error. If anyone has an actual issue with T9s please let us hear about it.
have had a *new* T9 that has been mining for only 8 days and two days ago one of the hash-boards shows no red light.
AND...??

Still not working? Reboot fixed it? Fixed itself? Blew up killing the family cat?
What a useless statement without details...
Plus of course there IS a T9-specific thread. Just usually far down because little to report in it.
https://bitcointalk.org/index.php?topic=1755286.msg19168097#new