This part already delivered more than 1 year ago.
We will have to charge for doing analysis.
Most probably is due to open circuit of one of the coils during usage.
It could be due to short-circuit, overload or damaged of the coil.
We will not be able to do troubleshooting of the PCB.
It is a simple transformer and you can check the continuity of the coils yourself.
Here is the circuit and you can determine whether it is the Primary coil or the Secondary 1 or Secondary 2 coils.