What was found
MIA - AFTER RETRACTION ON TAKEOFF STALL WARNING STICK SHAKER ALONG WITH ARVAL TONE, AIRSPEED WAS WELL ABOVE HOOK RETRACTED FLAPS WITH SLATS ONLY EVERYTHING SEEMED NORMAL UPON SLAT RETRACTION WARNINGS RETURNED ALONG WITH STRONG VIBRATION IN RUDDER PEDALS AS WELL AS YOKE. EMERGENCY DECLARED RETURNED TO MIA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND STANDBY ALPHA VANE BROKEN OFF. REPLACED STANDBY ALPHA PROBE. SYSTEM GROUND CHECK NORMAL OPERATION.