As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED "STALL FAIL" CAUTION MESSAGE WHILE LATER WE RECIEVED CONTINIOUS IGNITION, THE WARBLER & STICK SHAKER ACTIVATED. THE LOW SPEED & HIGH SPEED CUES SHOWED ON THE LT AIRSPEED TAPE WHILE INDICATING 280KTS. ACFT RETURNED TO DEPARTURE AFTER T/O. EMERGENCY DECLARED AS A PRECAUTION. R & R STALL COMPUTER. OPS CHECK STALL COMPUTER - GOOD IAW AMM 27-35-01-710-801. SDR CLOSED.