I have eventually switched provider and have a different fiber technology.
Installed a different module
Vendor Name ATOP
Vendor Part Number APSB43123CDL10
However it's still heating up. My hAP ac is standing inside a wall box with limited air flow.
The system board temperature is *53* degrees, and the module temperature is *59* degrees.
I should also note that I'm residing in Israel with average ambient temperature around *26* degrees.
This setup is running flawlessly for several months now (the hottest time here), current uptime *95d 07:29:46*