Ceiling issue

[Pwrengineer]

On our last trip we noticed the ceiling in our 2012 Avalanche from the first panel to the front cap has "tunnels" or something that looks like tunnels.
They extend from the panel joint forward.
These are approx 1/8" to 3/16" across and are in no special pattern. Is it an insect? We haven't had the trailer moved in several months and there are no signs of entry that I can find.
I have looked up if this is a common issue but cannot find any other posts. Anyone have a similar issue? Please help!

[chuckster57]

Cant say I've ever seen that. I would remove the batten trim between the panels for a closer inspection.

[SteveC7010]

Is that a bit of discoloration that I see in two of those trails? If something from inside the tunnel is bleeding through, that might give a clue to its cause.

When you drop the batten, you should be able to get some of the contents of the tunnels to come out. Again, more clues to the cause.

[ROLIN JOSEPH]

Pwrengineer,
I am only guessing but my first impression is a 'leaf miner' insect.
There are many varieties of this insect.
Type in Leaf miner on Google images.
If that's what it is, you can probably locate the insect(s) at the end of each trail.
I would peel away the ceiling paper skin, wash with a solution of Oxalic acid, and let it dry very well before wallpapering it again.

[Pwrengineer]

I did some exploration under the battens and found the tunnel to continue under the ceiling skin- some type of plastic wallpaper. I did find one white worm looking thing and heard a distinctive click coming from behind the panel. I cannot see where these things have entered even after getting on the roof. No entry holes or exit holes on exterior.

[chuckster57]

plumbing vents are one way a tiny bug can get into the roof structure. Eradication might be difficult, but unless you do something, your entire roof is at risk. May even be termites, can you post a pic?

[Pwrengineer]

Unfortunately I didn't get a pic of the worm-like bug, looked a bit like a grub but not as fat. If I can find another I will post the pic. We called a bug expert and they thought it might be a wood boring beetle? Whatever they are they just showed up quickly. And are unwelcome!

[Hoef]

If it were my issue, I would mix up some Thuricide (works on most worms and caterpillars), and Talstar (most everything else), and inject a bit into each tunnel with a hypodermic syringe. Both available from Amazon or http://www.domyownpestcontrol.com/ .

Just my $0.02...