I have a minor antifreeze drip and it appears to be coming from the area of this cover. Anyone know what's behind it, or if the drip could be coming from here?

Its the silver cover at the center of the picture just left and up from the oil filter.

'94 ES300

 

i'd pressure check the system and think about new hoses or watch this area for a drip, in which case you might have to move the silver cover to see what is leaking below it.