Disklavier

I have the same problem with my Disklavier GH1B as I have seen posted for the MX100 II, it will give me the same message Piano Power Off - (PWM Over)!" and will do the same if you restart it play one or 2 songs and stop did you ever fix the problem with yours thanks in advance.  I saw posted a solution:

The power supply have a 20V-regulater (IC2 MJN78M20FA) witch is operated outside of its specification. At the entrance he receives 50V instead of the 40V allowed! Therefore, it switches off automatically.I put a strong Zener diode in series, so that it works with <40V.  

Could this be the same solution for my problem, and if so has anyone posted detailed instructions with pictures and parts to fix it?

Thanks for the help... Brad

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