Do these jeans make my pork butt look fat?
In all honesty, if it were me, I would cook it and eat it. But when someone else asks me, I say what Vera said, when in doubt throw it out!
Tragic as the waste is, better safe than sorry in the end. But I also know in that case I wouldn't slow cook it either because that would probably make it even worse or more risky.
Just out of curiosity, did you take its temp with a meat thermometer or just guess at its current temp before putting it back in the fridge?