Need advice. coolant leaking by cam sensors

Hey guys,

Im new to this forum. My dad and I bought a 2008 4runner, V6, 4.0L with only 53,000 miles on it. The headgasket blew because there was a radiator leak. We replaced the headgasket and heads, the truck is running great now but we noticed its slowly leaking coolant from the camshaft position sensons or somewhere below them. We are trying to figure out why coolant would leak there. Any advice or ideas would be greatly appreciated. Im attaching pics of the leak by the sensors.

 

those sensors are o-ringed internally, i'd pull them with the engine off/cold (obviously) and see if they are deteriorated