Coolant leak from valve inside engine compartment?

[rsf]

Hello all…I’m hoping someone can help. I’ve searched a number of forums, but can’t find anything specific to my coolant leak in the engine compartment. In the picture (I have others pictures as well), you can see the coolant flowing out of a little (what looks to be) valve, however can’t find any reference anywhere on how to replace this. Do I need to pull out the coolant reservoir and would it be part of that process? The coolant reservoir looks good as does the reservoir cap (newer part number).

Any help or thoughts would be greatly appreciated.

Thanks!