In response to questions:
I did reset all the breakers with no change.
The test is done with utility power or generator power? On generator, No utility power available in storage yard.
Have you found why the tv quit? No power, worked when using power from a different outlet that had normal test reading.
50 amp or 30 amp RV? 30 amp with Onan 4000 generator
Have you measured the voltage? TV outlet had 13-14 and frigerator outlet had 36.
And no I don't believe the Hot & Neutral wires suddenly swapped terminals. I suspect floating neutral of a generator may cause a false reading or you have a bad neutral in a 50a setup.
