Have you tried the '26604' code? I've been trying to scour the internet to see if it is effective with this model as it has been with previous Dual brand dvd units. I am very interested in purchasing the 9131 as I want to upgrade. Please let me know of your findings!
The "26604" code only works for the older Dual systems will NOT work for xdvdn9131 - searched extensively for new code for newer Dual systems.... No luck yet.