tes824 After a power cut, the control unit, when it returns, does not restart itself.

[Didake]

Hi:
After a power cut, PBX, when it returns, does not restart itself.
This problem was documented in a pdf technical bulletin, but now I cannot find the service hit that spoke of it, I remember that a resistor had to be added or changed in the power supply and it was only for some versions of this control panel.
Someone will have the bulletin that mentioned the solution?
Thans in advance

 

[Mike_K]

It's a power supply PCB PSLP1278YA.

 

[Didake]

Thanks Mike, you helped me find

https://www.slideserve.com/tiger-byers/kx-tes-tem-824-service-hint

Regards