What was found
(CAN) NR 2 STALL WARNING/STICK PUSHER CAUTION LIGHTS ON, BUT THEN WENT OUT. ONCE AIRBORNE, CREW NOTICED THE NR 2 SW/SP CAUTION LIGHT AGAIN. CREW RETURNED. SW/SP COMPUTER REPLACED, BUT SAME PROBLEM OCCURRED. FURTHER INVESTIGATION FOUND THE NR 2 AOA VANE PINS 8 AND 9 WERE SHORTED INTERNALLY TO PIN 12. THUS, SW/SP COMPUTER DID NOT PICK UP FAULTY. ALPHA VANE REPLACED.