I had the same problem, different application. The paneling above the fridge was warmer than I thought it should be so I removed the vent cover on the roof. About a five minute job as I remember.(: When the trailer was built they didn't staple the insulation well enough in the flue and it folded over against the opposite side, cutting off the venting heat. Luckily it wasn't too far down from the roof that I could reach it with a stapler. I hope your fix is this easy...
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2003 Sierra SP 26'Toy Hauler
1997 F-350, PSD, 4X4, red Crew Cab, long bed.
2007 Arctic Cat Prowler, Arctic Cat 500