What was found
(PIREP) ON TAKEOFF ROLL RECEIVED THE TAKEOFF WARNING HORN. NOTICED FLAP INDICATOR WAS ON THE HIGH SIDE OF THE 5 DEGREE ARC (BETWEEN 0 AND 5 DEGREES). RETRACTED (CYCLED) FLAPS TO 15 DEGREES THEN BACK TO 5 DEGREES. FLAP INDICATOR SHOWED IT TO BE CENTERED WITH 5 DEGREES FLAPS. RETURNED TO TAXIWAY L TO ATTEMPT ANOTHER TAKEOFF. NO PROBLEMS THERE ON. NOTE: FLIGHT CREW WAS ABLE TO CORRECT THE DISCREPANCY AND NO LOG ENTRY WAS MADE.