What was found
ON DEPARTURE, CREW REPORTED STALL WARNING STICK SHAKER CAME ON AT ROTATION. CREW DUMPED FUEL, RETURNED AND LANDED WITHOUT ANY FURTHER INCIDENT. MAINTENANCE TROUBLESHOT STALL WARNING SYSTEM. OPERATIONAL CHECK NORMAL IAW B-727 MM CH 34-18-01, UNABLE TO DUPLICATE DISCREPANCY. AS A PRECAUTION, MAINTENANCE REMOVED AND REPLACED STALL WARNING MODULE IAW B-727 MM CH 34-18-41, OPERATIONAL CHECK GOOD IAW B-727 MM CH 34-18-01. AIRCRAFT RETURNED TO SERVICE.