What was found
FLIGHT 5298, STL TO PHL - THE FLIGHT CREW RECEIVED A LANDING GEAR AIR/GROUND FAIL MESSAGE AFTER GEAR RETRACTION ALONG WITH AN E1 AND E2 REVERSE DISAGREE. THE FLIGHT RETURNED TO STL AND LANDED WITHOUT INCIDENT. DURING TROUBLESHOOTING THE RIGHT MAIN LANDING GEAR SHOCK STRUT WAS FOUND TO BE LEAKING HYDRAULIC FLUID, THE NOSE LANDING GEAR STRUT WOULD NOT EXTEND OR RETRACT CORRECTLY, AND THE AIR/GROUND RELAY K0352 WAS REPORTED STUCK. THE RIGHT MAIN LANDING GEAR SHOCK STRUT WAS REPLACED, THE NOSE STRUT WAS FULLY SERVICED AND RELAY K0352 WAS REPLACED. THE AIR/GROUND SYSTEM THEN OPERATED NORMALLY.