I am pretty sure there is a frame Mod kit out for that chassis. the model is slightly different to the models we have but. the Frame chip will be a TDA8350Q and is actually the likely culprit. It would need aversion 4Y or later fitting. There is also a 220UF capacitor to change.
You could get lucky and someone may have gone into the service mode and altered the Frame shift but it may well have a problem