Quite possible the 30/20 breaker itself was the problem. Breakers do go bad. Breakers get hot with a problem, not because they need cooling airflow.
I had a ganged 50 amp go bad, dead giveaway when it started to sizzle as I flipped it on.
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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