What was found
IN CRUISE AT 25000 'PUSHER SYST FAIL' CAUTION LIGHT ILLUMINATED. RAN E&A CHECKLIST TURNED OFF STICKER PUSHER SHUTOFF. NO LOW SPEED CUE ON AIRSPEED TAPE. AFTER LANDING ON ROLLOUT BOTH NR 1 & NR 2 STALL SYST FAIL CAUTION LIGHTS ILLUMINATED. REMOVED FROM SERVICE. FOUND CB AT LEFT AOA HEAT POPPED. RESET CB AND PERFORMED ENGINE RUNS WITH CREW, CB POPPED. R & R LT AOA TRANSDUCER REF Q400 AMM TASK 27-33-26-000-801 & 27-33-26-400-801. PERFORMED FUNCTIONAL TEST REF AMM 27-33-26-720-801. FUNCTIONAL TEST GOOD. RESET BREAKER & PERFORMED ENG RUN. CB DID NOT POP. PERFORMED AOA SENSOR-HGS RETURN TO SERVICE CATIII OPS TEST IAW MTC 6273302. AC REMAINS CAT I QUALIFIED. COCKPIT PLACARD READS CAT I. MTX CONTROL NOTIFIED. AC REMAINS CAT DUE TO FMS NR 1 MEL.. AIRCRAFT RETURNED TO SERVICE.