What was found
(CAN) ON 26-JUL-2019, UPON DEPARTURE, IT WAS NOTICED BY THE FLIGHT CREW THAT ALL 3 RED GEAR UNSAFE ADVISORY LIGHTS REMAINED ILLUMINATED WITH THE GEAR HANDLE IN THE UP POSITION. ON CONSULTATION WITH THE DISPATCHER THE CREW ELECTED TO PROCEED TO THE DESTINATION AIRPORT AND LANDED WITHOUT ANY FURTHER INCIDENT. THE MAINTENANCE CREW CARRIED OUT AN INSPECTION AND REPLACED THE LANDING GEAR SELECTOR VALVE IAW AMM 32-31-06. THE AIRCRAFT RETURNED TO SERVICE WITHOUT ANY FURTHER INCIDENT. (TC# 20190731018)