As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 205 FROM IND TO DFW. IN TAKE OFF CONFIGURATION, WHEN THROTTLES ADVANCED, THE TAKE OFF WARNING HORN SOUNDED. THE AIRCRAFT TAXIED FROM RUNWAY AND RETURNED TO GATE.FOUND TAKE OFF WARNING SWITCH CONNECTOR DIRTY. CLEANED CONNECTOR. PERFORMED TAKE OFF WARNING OPS CHECK AND ENGINE RUN. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.