The only occasion I can find that looks like he was under hostile attack was the mine, and that went off under another boat.
Was any American wounded or killed during action where Kerry was present?
"Is there anyplace that verifiably says that Kerry was actually "shot" at?"
I couldn't find anything apart from the reference to the mine.
"Was any American wounded or killed during action where Kerry was present?"
The after-action reports on the 3rd PH/Bronze Star incident describe mine explosion injuries to members of PCF-3, and also prior to that on the same day there was a Vietnamese ally who was killed. I'd need to review other incidents. The relevant information would be in the February and March spot report files.