Are DTC's wiped out when you flash ECU?

Hi All,
New TRD OR 4x4 production date 03/19. One of the few unlucky ones to have the brake override malfunction horror show on my truck twice in less than 40 miles. Thankfully had my scanner and was able to clear the codes to get back on the road. It's been about 500 miles now without issue but I want to take it into the dealer. Thing is, I have flashed the ECU 3 times now from 87 base, back to stock, and now 1.05.1 base.
I understand there are issues with the radar sensor and possibly the throttle actuator (P2119 at same time of brake override malfunction). Will they still be able to find those faults through techstream even though I have flashed different tunes on it since the issue? I just don't want to look like a dumbass telling them about these life-threatening hard faults and there be no evidence when they hook it up to the computer.

 

I gotta ask. How are you "flashing" the ECU?. What scanner does this?

 

Sorry Les,
Posted in wrong thread. I was referring to Ovtune ECU flashes. Best thing that ever happend to the 3.5L by far. Check it out.
https://www.tacomaworld.com/threads/2016-toyota-tacoma-ovtune-1-05-tune-development-thread.495735/
Roll on and get dirty brother!