If this PS4 was
leaking liquid from the rear vents, why would there be residue on the 'AUX' port for the PS Camera as well as the lower rim before the vents?
Surely if something was leaking out it would only come from the vents?
I am also one whom had no idea about the Vapour Rub on a humidifier but it reminded me of something.
I recently took apart my YLoD PS3 and used a can of compressed air to clean the layers of dust whilst tearing it down, and I noticed once the can was nearly 'empty' there was a liquid coming out that left a white residue similar to the pattern found in this image;
I'm not suggesting there is a link, but perhaps someone could shed some light on it. It is a strange occurrence and definitely something worth the discussion because it could be something serious. My PS4 looks fine but I will keep an eye on it. Mine is situated on a black glass shelf with sufficient space all around in, no humidifier/fans nearby but I will report here if it happens to mine.