Pinhole leak

I just did an oil change on my 2018 Tundra at 90K miles. While under the hood, I noticed some pink colored dried coolant on a hose above the serpentine belt to the right of the center of the radiator fan. After clearing away the crystallized coolant, I discovered a pinhole leak in this hose (you can see the darker damp area in the photo). I'm used to doing all of my own maintenance and I was looking forward to the challenge of swapping out this hose, but the hose leads into the abyss and I have no idea how to access the other end. In the words of Dirty Harry, "A man's got to know his limitations" and I'm not sure if this is something I should pursue. I would appreciate any comments about what hose this is and whether this is best left to a mechanic or if I should do a deep dive into the unknown. Thanks in advance.