I'm stumped about this toilet issue, there is a gurgling noise and a few air bubbles after the flush is complete and the bowl is refilling. It is two years old (mansfield) the main drain has been snaked to the road, the vent stack on the roof has been checked and clear (plumber checked). The rim holes are clear the water flows great out of all holes. The toilet flushes great with or with out solids. It's just the few air bubbles & gurgle as it refills that is driving me nuts....any Idea's ?