The calibrated eyeball is your friend. Any visible signs of heat stress will point either to a problem now, or a problem later.
A resistor burned in half indicates a severe surge current.
My intuitive guess is badly-weakened tubes. The 811A is quite unforgiving of severe overloads. A shiny spot at the center of the flat, gray anode in each tube indicates severe overheating. The kind that can damage a tube permanently. And if the surface of the metal was breached or has a hole melted in it, that tube can no longer be trusted.
Don't know how long she keyed it with a carrier on it. My intuitive guess would be that it was long enough to flatten the tubes, making them weak forever.
Kinda like draining the oil from your daily driver and heading down the street. There is no doubt there will be damage. How much and where depends on how far down the street you drove it.
73