Do your brakes work ok? Any difference in stopping power or difference in feel of the pedal? If there is an imbalance between the front and back section of the M/C, the differential switch would indicate that to you. You should be able to feel that by applying heavy pedal pressure and holding it, noting whether the pedal fades. Cruise control malfunction, got me on that one, but my guess is that they are not related.
In the past the differential switches could be reset. Not sure on this one though. It is nothing more than a toggle switch. If you screw it out, you can try to reposition it to the neutral position. They only trip when the pressure changes between the two chambers. Like when the brake are being bleed or when one of the chambers has an imbalance in relation to the other chamber. Brake Systems - the pressure differential switch