Don't know about T9, i just received 4 x T9+ - 10.5th on 11 jun 2018, 2 x T9+ running flawlessly but 1 of them lost 5 chains out of 9 chains in an hour  i sent it back to hong kong the next day.

Another one lost 1 chain upon first run, re-boot few time still the same, and lost another chain on the next day  decided to run it until bitmain return the 1st one then i will sent this 2nd unit back to them.

so, T9+ may not = T9