There is good news and possibly good news.
First have a Decent RV tehcnician go through and check EVERYTHIGN electrical/electronic. I agree with the upgrade to a prograssive dynamics converter.> The model number are 4 digits. match the last two as close as you can to the unit you have now (IE a xx45 to xx 45 or xx60)
THe first two If you have an intergrated power distribution/Converter Like a Magnetek 6300 or Parallex 7300 series. Go with teh 4600 series (just replace the electronics) if the converter is a box. by itself 9200 series or 9100 WITH the optional Wizard (The two are almost identical for most Rvers.. I find the button on the wizard useful. most do not).
OF course you need a new TV. if you have a radio or other electrionc device that eats 120 volts it will likely need replacement. Refrigerator and water heater may have suffered.
And the electrican.. LIABLE in many cases
you see the outlet says right on it 125 volts maximum. He failed to read.