What was found
SFO - AURAL WARNING FLAPS ON TAKEOFF REPORTED. TAKEOFF ABORTED. MAINTENANCE REPLACED FLAP SELECTOR HANDLE. OPERATIONAL CHECK NORMAL. TEST FLIGHT SATISFACTORY. AIRCRAFT RETURNED TO SERVICE. NOTE: PROBLEM RECURRED 7-10-97 WITH AN ABORTED TAKEOFF IN SFO. MAINTENANCE TROUBLESHOT INTERMITTENT AURAL WARNING PROBLEM. FOUND HARD FAILURE WITH AURAL WARNING UNIT. REPLACED AURAL WARNING UNIT. SYSTEM OPERATIONAL CHECK NORMAL ON GROUND AND DURING SUBSEQUENT TEST FLIGHT. AIRCRAFT RETURNED TO SERVICE. (X)