Remove lower outside cover and see if there is new shielding around burner area.
This is one example of new shielding.......
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2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31