The Antminer T9 has a total of 171 chips, which means every single hashboard has 57 of them (unlike the S9 which has 63 each), the 3rd board which should be most left when standing in front of the miner (you can check the label on the control board it will be labeled there, either as J8 or something that represents the last number like 1,2,3 it will be 3).

Check if that board is connected, check both the data/ribbon cable and the power cable from the PSU, swap hash boards and see if the kernel log changes, if not, try to flash the control board with a different firmware, if all fails, it means one of the chips is dead and needs fixing, which isn't an easy thing to do.

And by the way, please use the code tag next time to post your kernel log.