2011 sienna 2grfe 3.5 v6. I was under it to drain the antifreeze and at the rear of the engine, center of the cylinder head where it meets the block, there was a bit smaller than a golf ball size dried up crusted up glob of antifreeze. I saw no trail leading there, although I do work on it in my driveway so it's a bit harder to get a good inspection. I ran out of time after bleeding it (kicked my butt getting the air out of it). Kids home from school due to Coronavirus so I didn't get a pressure tester on it to watch for active leaks. I cleaned the crust and plan on monitoring it. I never needed to top off coolant. I've never smelled it. I've never seen it drip. But it's obviously leaked at some point. Anyone know of anything that leaks and leads to that area? Someone familiar with this engine may know. It's kind of a mess under the hood so just looking for anyone familiar to see if I need to look anywhere in particular. Is this a common issue on 2grfe? I follow a Toyota tech on Instagram and he's done some head gasket in the short time I've followed him, along with a few coolant crossover pipes. A head gasket would likely drive me to get rid of this van if it got so bad it requires repair. It's not something I could easily do in my driveway. Thanks for any insight.