Lil Bigfoot leak question

[Clipse79]

I have lil Bigfoot 1987 we restored. Found a small leak that collects under front bunk in middle between the two bolt struts (name not sure). It's a super.small and slow drip that comes from straight up from the window area behind the insulation

Any idea what the culprit could be? Did some caulking on band and checked windows. Sprayed with hose and nothing so it's somewhere else.

[Gilles]

Do you have positioning lights in the front, above the window?
I have a similar problem and just before undoing the window I checked the positioning light globes and the silicone around the lights no longer prevented water from entering, and the buthyl tape inside was no longer not present enough to prevent water from seeping into the wall.
I cleaned, re-added butyl and resealed with a silicone gasket around each light and my problem was fixed.