YDS/ECU - overheat warning question

[Madcityami]

So I know I had at least one overheat warning on my port engine last season (blinking light on tach). However, when I plugged in YDS today, it still just shows the one overheat from the previous owner. Does the ECU only hold one warning? Am I supposed to delete/clear the code? Or was my last overheat not bad enough to register in the ECU?

I’m running a 2010 vintage YDS software if that makes a difference.

Thanks in advance.

 

[WREKS]

I usually see just the latest one, also, however, I always disconnect the battery. Maybe that clears the ECM.
I use an infrared thermometer (Harbor Freight) to test for overheating. Run on hose for ten minutes at No-Wake rpm. Take readings on cylinders below exhaust manifolds. Anything above 200 degrees puts engines in limp mode. That procedure indicates internal blockage.