I experienced flipper fading on the upper PF of my ACNC as well as on the lower PF. After some time it became nearly impossible to backhand the Frankenstein ramp from the left flipper or to succed the ramp on the upper PF for the second Frankenstein lock. Installation of DIY fans on all three flipper coils solved the problem for me.
Since flipper coils on the Scooby Doo upper PF are activated simultaneously to the coils on the lower playfield, especially in trap play I would expect some effects…