What was found
(CAN) ECAM MESSAGE ILLUMINATED FOR HYD RSVR LO LVL. ON HYDRAULICS PAGE LEVEL APPEARED NORMAL. SELECTED TO RETURN TO YYC. DURING APPROACH, YELLOW ELECTRIC PUMP SELECTED BACK ON. PTU SELECTED BACK ON. PROBLEM WENT AWAY. MAINTENANCE CHECKED BSCU, NO FAULTS FOUND. UNABLE TO FAULT, ALL PRESSURES AND QUANTITIES CHECKED NORMAL.