Is this a sign of AC compressor leak?

My truck overheated last year due to a 114 degree summertime heat and full blasted AC in a slow drive thru line. At that time I noticed a white smoke come out from underneath the truck. I immediately turned my ac off and temp went back to normal. Now I was checking my engine and noticed this.i
It looks dry and all but idk if this was from the overheat I had last year? Does this pic indicate an active ongoing leak or it miraculously stopped and just left a stain on my high pressure line? Help guys my OCD is kicking in!! lol

UPDATE:
I checked the underside of the line and it looked really clean. So I’m assuming that something just spilled on the line during oil change or whatever it is that spilled on it (I hope that’s the case) lol

 

No idea, have you had the ac system pressure checked or checked to see if refrigerant is low?

My ac compressor has an occasion whirring noise when turning on from the passenger side floor board. I'm going to get it checked soon.

 

I haven’t had my system checked but my ac works fine and I get a whistling noise during acceleration and disappears. The whistle noise started after my overheat incident.

 

That sounds like my compressor. A whistle or whirring noise. It's been doing that for over a year and still works fine.