Sony Bravia Switch Button Panel?

I have a Sony Bravia Model KDL-S32A12U which has a worn power button on the top panel. I have removed the switch panel and disassembled it and found two problems:

1. the power button has become detached from the moulded button assembly
2. the switching pad on the PCB behind this button has become deformed inwards and is permanently domed in the activate position.

Can you suggest where I can get either a whole switch button panel assembly or both the PCB and moulded button assembly for this TV, please?