Mike, this is why I told a story about an old Showman I worked on. It had factory equipped boo-boos and lasted decades that way. What if, for example, a 68 ohm resistor ended up in the 150 ohm bin and no one noticed it? On final test, the amp would have sounded great, so out the door it goes. It's a manufacturer's nightmare. No amount of process can really stop someone from a spaz moment where everything looks perfect.The amp is not biased to meltdown.
12.8 watts per tube at idle, a bit over spec but by no means MELTDOWN.
The total currant draw of the two EL 84's is appox. 72 mA , a 5AR4 is rated at 200 mA on the low current production side, 250 mA if your talking Mullard GZ-34.
From your point of view, I can't see asking the OP to open the amp up, poke around, and take pictures...too risky liability-wise. It has to happen somewhere though.