I'm pretty sure it's the circuit board. According to that brief I posted you might have the same problems with the 011 board you purchased, eventually. My 004 board worked fine for 6 years before I had a real problem. I took out the board again and actually bridged some of the short (distance) circuit board connections with solder, in case it was one of those that had a hairline crack, and it has been working flawlessly for about 2 weeks now (fingers are crossed). I still might have to replace the board eventually.
That's interesting about the sequence change. Mine would fail after the first blower came on, when the second motor was trying to start. I had between 15-30 seconds to fiddle with the plugs to get the motor to stay on, the entire sequence then would complete and heat would come on.