Well the CWIL in not a “dumb” board like a CWIK. The CWIL has 2 processors, it’s a CAN node, it interfaces the selector and runs an SPI loop for the COP functions in question. The problems I’ve had with it have all been CAN related. The last one I replaced would take down the CAN channel after power up until it was physically reset with the reset button. There is plenty to go wrong now.