If you suspect the furnace vent, remove, thoroughly clean and re caulk it using gray butyl tape or Geocel RV Sealant - not silicone.
It may well be that the leak in the shower is coming from the glass panel assembly - especially the door. Have a good look at all the seams and re caulk any areas that look suspicious. Pay particular attention to where the panel meets the bottom shower floor enclosure.
If silicone has been used as a sealant then applying another coat of silicone will be problematic since silicone doesn't adhere to itself. Try to find another product suitable for this type of application that is not silicone based.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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