What was found
(CAN) AFTER DEPARTURE THE CREW HAD AN AIRSPEED INDICATOR PROBLEM AND LATER DETERMINED THE AIRSPEED WAS CORRECT, BUT THE BARBER POLE INDICATOR SHOWED AND THE STICK SHAKER BECAME ACTIVE. THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO LAND. THE EMERGENCY VEHICLES WERE STANDING BY FOR THE ARRIVAL. MDC SPC CH NR 1 LBL 350 BIT 12 AND 13 SPC CH NR 2 LBL 350 BIT 12. LT AND RT AOA VANE CHGD IAW AMM 27-35-05-400-801, LT MACH TX CHGD IAW AMM 27-35-25-400-801. OPERATIONAL TEST OF AOA LT AND RT DONE IAW AMM 27-35-05-710-801,LT MACH TX FUNCT TEST DONE.