I doubt it's an air leak since you haven't had issues in the past. Maybe you had a few briqs combust at one time which spiked the temps. Since it's insulated temps will come down pretty slow.
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LSG 24x30 V/O
Yoder YS640
DCS 36 Gasser
Blackstone Griddle Retrofit
Blackstone Pizza Oven
WSJ(K) WGA(P) WJJ(CU) W22(BI) W26(CL)
Pit Barrer Junior
Kingsford Oval (resto mod)
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