Actually, I remembered wrong – water is NOT spilling into the overfill tube – the water level is about an inch or so below the top of the tube.
But I do see water dribbling into the back of the toilet bowl, and if the water gets low enough and the float falls enough, the refilling of the tank is triggered. Do I have a bad seal somewhere, and would this be solved by my friend’s suggestion of an expansion tank?
Thanks!
Christina