As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABORTED TAKEOFF AND RETURNED TO THE GATE BECAUSE THE SPEED CARDS FELL ON THE AURAL WARNING TEST SWITCH CAUSED IT TO GO INTO A TEST MODE. CREW HAD TO WAIT TILL THE TEST TO FINISH BEFORE ATTEMPTING ANOTHER TAKEOFF AND PROCEEDED ON. NO FURTHER DEFECTS NOTED.