If that function was put in use by the previous owner, the fastest way to change the parental lock out would be to contact your friend and get the access code from them.
Since the set probably uses a bit of flash memory to store the access code and other settings, if an individual chip, that would have to be physically removed and replaced.
If you can locate service information on your set, it will likely contain a procedure to set the memory back to factory default.
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I have the same problem, My mother forgot her code for the ratings.
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