What was found
DURING TAXI, FLIGHT CREW PERFORMED FLIGHT CONTROL DEFLECTION CHECK, DID NOT GET FULL DEFLECTION OF SPOILERS. CREW ELECTED TO RETURN TO GATE FOR TROUBLESHOOTING/CORRECTION. ACFT RETURNED TO GATE WITHOUT FURTHER INCIDENT. AFTER EXTENSIVE TROUBLESHOOTING, MAINTENANCE PERSONNEL FOUND CONNECTOR PIN PUSHED BACK IN CANNON PLUG TO NR 3 HYDRAULIC SYSTEM FLIGHT CONTROL BYPASS VALVE. PIN/WIRE WAS REPAIRED. OPS CHECK PERFORMED WITH NO MALFUNCTION NOTED. ACFT RETURNED TO SERVICE. (Z)