Once I saw a man in Saddar, right outside of OCS office a few steps away from police officers colony and coming towards sadder chok and he was repairing the electrical mirrors.
I asked him what kind of repairs he can do, and he said all types of damages, electrical motors, mirror replacements, etc. he is doing well. And when I asked him cost then he said he charge like 300~500 only depends upon work.
I think you can try him. But you have to find him near OCS office. He was sitting on footpath and I saw him repairing side mirrors.