As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CREW OBSERVED AN AURAL CONFIGURATION WARNING ON TAKE OFF WHEN THE GEAR WAS SELECTED UP AND FLAP 15. THE A/C RETURNED TO BLOCKS WHERE IT WAS DETERMINED THAT THE SPEED BRAKE WARNING SWITCH WAS OUT OF ADJUSTMENT. THE SWITCH WAS ADJUSTED AND THE TOW CS CHECKED SERVICEABLE IAW MM31-26-25 AND THE A/C WAS RETURNED TO SERVICE.