Welcome to the forum. 
If you have an OHM meter or test light, check it for voltage. IF air is live it will only be 12VDC. It could be construction debris, I’ve seen lots of crazy stuff stuck in silicone.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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