Hi,
The transformer is a consequence.
The internal structure of the transceiver microcircuit is probably damaged.
If the switch is multi-port, there can be several of them and, as a rule, they have a cooling radiator.
If you have a pyrometer, try to determine which chip is by measuring the temperature from the bottom of the PCB.
It is unlikely that you can restore working capacity: you need to find a donor and re-solder the BGA.
Alas.