Our toilet has a dripping noise. The drip is not coming from the tank -- I replaced the flapper and the fill valve, and both are working properly, The tank is not losing any water, but I suspect that the bowl is somehow. Any advice would be welcome. Thanks.

Let's start by checking the flush valve and flapper to be absolutely sure.
Tonight put food coloring in the tank and let it set over night. Any color i9n the bowl next morning ? Does the bowl lose water overnight? Make a pencil mark at the water line before bedtime and putting in the food coloring. Let me know what you find in the morning. Cheers, Tom