I would still suspect brake lamp switch.. very common and this is one of those "Change it" recommendations as it takes longer to catch it faulting than it does to change it. [ cheap part] One of the few times I will try a new as part of diagnosis [ the other being an OVP relay]

..do a search and be sure to use OEM sw.
What happens with the codes is they will clear themselves after so many no faults , so an intermittant problem like a set of sw contacts can show as a no codes and still be the fault.............depending on when you go checking.
If the asr comes up again , immediately code check