Ours (2004) is from bow hook.
You can eliminate it as an issue by getting a tube of silicon caulking (clear), put it around the eye hook and nut fittings (cake it on pretty thick) and see if it eliminates the water coming in. If it does, you know where it was coming in at, if it doesn't, it is pretty easy to pull back off.
I don't see a way to access behind the bow hook so I just leave the silicon in place, and when it starts coming in again, I remove the old and redo.
2004 Supra Launch 22 SSV
5.7L Indmar Assault
"One More Hour"