So yesterday I had my A/C going full blast and for the first time in my 62's life, the heater breaker popped. I reset it and it seems fine for now. I did some digging and apparently both the heater relay and the breaker itself can deteriorate with age and start allowing too much current to pass through, leading to regular popping of the breaker. I've got a newer fan in there and replaced the fan resistor about 4 years ago, so if my breaker keeps popping, I want to go ahead and replace both the relay and the breaker. Are either still available new?