"Factory" rebuild? Do you mean dealership rebuild? I don't think it goes to any factory for a rebuild. Maybe just for a remanufactured engine. Either way, I would think a quality rotary specialist shop would be more qualified, especially one that offers a warranty. Unfortunately, a lot of rebuilds that don't last are due to problems that existed in the first place that were overlooked for numerous reasons, and there are some problems that are fixed with aftermarket solutions (How many dealerships would think to change, let alone upgrade the thermal pellet?). You can fuck up your housings and rotors and still have them looking good to the untrained eye, and that's going to make each rebuild die quicker than the last.