The truth of the matter is the new SECs are simply too fast.
It was explained to me in simpletons terms - They send a signal to check the ELAC response but the delay for a response from the ELACs is too quick - before the ELAC have even responded. In not getting a signal, the SECs think the ELACs are offline and not available. The reset after powering up the second engine reinitiates the test when the ELACs are online.
The SB to fix the problem is already available and it's a simple software download.