What was found
(CAN) DURING TAXING, DISAGREE AMBER LIGHT REMAINED ILLUMINATED WHEN SLATS RETRACT SELECTED. AIRCRAFT WAS FERRIED. DURING CLIMB OUT, SLAT DISAGREE LIGHT EXTINGUISHED APROX 13000 FT WHILE SLAT RETRACTED. AT YUL, MAINTENANCE DID FUNCTIONAL CHECK IAW MM AND NO FAULT FOUND. AIRCRAFT RELEASED SERVICEABLE.