Burning coolant

[tree98]

Just got back checked the turbo, it's dry. At this point I'm thinking it's either

A.... a really small leak in the EGR cooler that only opens up and leaks sometimes, possibly only when the engine is hot??

B.... a bad injector cup, also barely leaking

C.... a bad o-ring on an injector(not likely because I would think it would leak quite a bit of coolant past a torn o-ring)
I doubt it would be a dropped liner or a cracked head just because the engine has such low miles but who knows???
Should I drop the pan and look for coolant coming down a cylinder wall?