Yes, it was. But it was more than the circuit breakers, there was a breakdown of reliable communications between the cabin attendants and the captain. At first, NTSB found fault with the flight crew (1984), but after a redress and petition by ALPA, NTSB revised their report (1986) and exonerated the crew actions.
The critical gap of four minutes between 1904 and 1908, when the emergency descent was initiated, was all the difference between getting the plane down sooner (Louisville) rather than later (Cincinnati).
That is what it seems to say
here (NTSB). The inside story I had heard was that the pilots kept resetting the circuit breaker in the cockpit and eventually held it in, which allowed a lav motor to catch fire.