What was found
DCU: AFTER TAKEOFF, DURING CLIMB OUT. WINSHEAR WARNING ALERT OCCURRED WITH NO PERCEIVABLE WINDSHEAR. BOTH LOW SPEEDS AIRSPEED TAPES INDICATED A STALL CONDITION. AOA WENT 1.0 ON BOTH PFD'S. DCU #2 EICAS, APR INOP., EICAS COMP INOP WERE DISPLAYED ON RHE EICAS. AFTER APPROXIMATELY 2 MINS THE AIRSPEED TAPES RETURNED TO NORMAL. WE RETURNED TO THE AIRPORT PERFORMING NORMAL PROCEDURES TO A LANDING. // SIGNOFF// SWAPPED DCU #1 AND #2 PER BOMBARDIER RECCOMENDATIONS. OPS CHECKS FOR BOTH DCUS WERE GOOD. DIRECTED BY MCC TO LEAVE THAT WAY AND SIGN OFF. ALL WORK DONE IAW CL-650 27-35-01-801. DCU IN POSITION 1 PN/SN: 822-0179-206/4095HK DCU IN POSITTON 2 PN/SN: 822-0179-206/2RKFD