It's not a big deal , so don't worry about it til it does , if it does..
Intermittants and glitches are very difficult and you may never find the original cause.
If it were me, I would build that led tool and go into the HFM and EA modules every once in a while and see what pops up before any ASR or CE lamp notification..You may just catch it before it clears itself again.
Pending codes are accessible w/tool before they trigger a lamp and the diagnostic modules are fast enough to catch them...but you have to catch them before they clear themselves b/c they do not repeat...
Pin 8 and 14.

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A Dalton