For those that have the Dometic Magnum Opus electronic toilet, if you find yourself in need of a control module and do not want to replace the entire toilet Northwest RV Supplies in Eugene Oregon is selling an aftermarket controller.
If you are a member of the Monacoers group you can purchase the module via the forum at a substantial discount, enough of a discount to have a one as a spare.
I installed one of the replacement modules on our SeaLand and it seems to be working great.