All of the items that would trigger the warning are essential for flight (save the parking brake), so the answer is fairly straightforward. You stop. It may be later determined that the warning was caused by a faulty sensor/indication problem, but at or near V1 is not the time to consider such things, nor is it the time to be reconfiguring.
That same horn at altitude, on the other hand, is an entirely different kettle of fish on the 737.