What do you mean it works?
Is the issue solved after a hard reset? Is all the hash board running?
Or did you just run only two hash boards and remove the middle board?
If the middle hash board is the culprit having over temp issue there might be one ASIC chip with a loose heatsink it needs to reattach but the problem you will need test fixture to test which chip is overheating.
Anyway, if you want to repair it with your own there is a guide that you can follow but I'm sure it needs some repairing tools. Check this link below
-
https://www.zeusbtc.com/manuals/Antminer-S19-Hash-Board-Repair-Guide.aspSorry for the delay - all 3 boards started working after your recommendation, and it seemed to have worked for couple of days.
I brought the machine back home from the data center, as I see i board running hotter. 2 boards have a 15/15 Inlet/Outlet temp, 1 has 42/65 temp on it.