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I'm sure there are plenty with 'can't find car' on their MOTs ;)
Doubt remaps are going to be testable, what are they going to do, read the ECU of every car they test?
If it's still happening with the standard bulbs in then the power is getting across somewhere else, probably at the clusters or connectors. Clean everything up, see if it still happens.
You've already posted a thread on this, we suggested trying the standard bulbs again as it sounds like the LED bulbs are shorting across the brake and tail light circuits.