What was found
FLIGHT 7629 AUS TO ORD, ON TAKEOFF BEFORE FLAP RETRACTION RECEIVED SLAT FAIL CAUTION MESSAGE. CREW RTF AND LANDED WITHOUT INCIDENT. MTX CLEARED MESSAGES, CYCLED FLAPS SEVERAL TIMES, DETERMINED SAFE FOR FLIGHT. ON SECOND TAKEOFF, CREW GOT SAME SLAT FAIL MESSAGE. 0/0 ON SLAT/FLAP POSITION INDICATOR. CREW WAS ABLE TO DETERMINE THAT SLATS WERE FULLY RETRACTED. EN ROUTE PORTION OF FLIGHT NORMAL. LANDED WITH SLATS 0, FLAPS 2. MAINTENANCE REMOVED AND REPLACED RT OUTBOARD SKEW SENSOR. OPS CK GOOD, NO DEFECTS NOTED.