As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C HAD AN AIR TURNBACK AFTER TAKEOFF FROM YYZ. PIREP A43921 READS "LANDING GEAR DOES NOT RETRACT WHEN LANDING GEAR LEVER MOVED TO UP POSITION". MAINTENANCE FOUND THE GROUND SPOILER INTERLOCK VALVE RIGGED TO IT'S FAR LIMIT. THE INTERLOCK VALVE WAS RIGGED IAW AMM 26-62-61, GEAR SWINGS WERE CARRIED OUT WITH NO FAULTS FOUND AND THE AIRCRAFT WAS RETURNED TO SERVICE.