What was found
(CAN) IN YQB, HAD TO SHUT NR 1 ENGINE DOWN WITH FIRE HANDLE SINCE MOVING THE HP FUEL LEVER NR 1 TO THE OFF POSITION. CLOSE THE HP FUEL VALVE. MAINTENANCE IN YQB, CHECKED THE FUEL SYSTEM FOR PROPER FUNCTION, IN ACCORDANCE WITH THE AMM 71-00-00, P.534 AND CHECKED SERVICEABLE. THE AIRCRAFT DEPARTED FOR YYZ. MAINTENANCE IN YYZ ALSO REPLACED FOR PRECAUTIONARY REASONS, THE NR 1 HP FUEL SOV SWITCH I.A.W 76-12-11, THE NR 1 ENG. FUEL SHUT OFF RELAY 27 KC I.A.W. THE ELECTRICAL STD. PRACTICE MANUAL 20-46-50 AND THE MAIN ENG. CONTROL I.A.W. THE AMM 73-21-01 P.401