I too have problem with CTA1. Do you guys know which board is the CTA1?
is it next to the 2 Power Supplies?
TIA
I just replaced the water cooling block on mine. CTA0 for me was the board closest to the 2 power supplies(right hand side when facing the front). CTA1 was the board furthest away from the power supplies(left hand side when facing the front).
Good luck.