What was found
AIR DATA HEAT COMPLETE FAILURE AOA, STATIC, PITOT, RAT, RUDDER, AIR TURNBACK. ACCOMPLISHED FIM TASK 30-30, TASK 814. REPLACED AIR DATA HEATER SWITCH IAW WDM 30-31-01 AND REPLACED DCU IAW AMM 31-43-02. OPS CHECKED OF DCU IS OK. OPS CHECKED OF AOA, STATIC, PITOT, RAT, RUDDER HEATERS ARE ALL OK IAW AMM 30-31-00. NO FAULTS NOTED. OK FOR SERVICE.