From this post, I only know that Vector Auto no more authorized Proton Service SC but they still charging for SC rate. :-(.
Anyway, already few months back. Now I service outside.

My Proton Persona just change the battery. When I change the battery, the engine was started. So it is OK.
I switch off my engine and start back, it is OK.
However, 2nd time I switch off my engine and start back, the voltage was not stable. It is causing my CD player was locked with security code.
I check the user manual, the default is "0000". I call the Proton Service helpline as well. They revert the same.
However, it is not a right code. Anyone know where can I unlock this ? :-(
Your help is much appreciated.

Thanks. Will do.