You are correct, although I don't know how many if any actually caught fire. More like pushing the dipstick up out of the hole from lack of ventilation.
Don't be fooled by the not so perfect Aisin. There is also a TSB on torque converter replacement for 13-16. And LOTS of 19+ owners not happy with the (lack of shifting) performance. Do your homework before you buy.
FWIW, my 14 3500 68RFE has been flawless @120k miles. It's an adaptive transmission, drive like a gma shift like a gma. Use the truck for what it's meant for it shifts and drives like you would expect.
Here's my towing mileage, which is reset every oil change and very typical. As you can see, it gets used.
View attachment 122979
View attachment 122980
Pictures hard to see but it equates to a hair under 45% towing miles. That's pretty consistent through the life of the truck.
Other benefits of the 68rfe over the Aisin. Transmission fluid for the 68 is readily available EVERYWHERE society exists vs dealer only or wherever you can source Mobil conventional transmission fluid online for the Aisin. Synthetic ATF+4 is cheaper than conventional Aisin fluid. 68rfe service intervals are twice as long as the Aisin factory recommended service intervals.
Sometimes hard to believe this is really a topic