What was found
FLT 783 - CLT-ATL - AFTER TAKEOFF, FLIGHT WAS UNABLE TO RETRACT LANDING GEAR. NOSE GEAR UNSAFE LIGHT REMAINED ON. 'AUTO SPOILER DO NOT USE' LIGHT CAME ON. PRESSURIZATION BECAME UNSTABLE. FOLLOWED ABNORMAL PROCEDURES. DID NOT HELP. FLIGHT RETURNED TO CLT WITH NO FURTHER INCIDENTS. NORMAL LANDING. MAINTENANCE FOUND NOSE STRUT NOT EXTENDING FULLY. REMAINED IN GROUND MODE. COMPLETED NOSE GEAR STRUT SERVICE USING A/C ON JACKS PROCEDURE. ALSO DID FULL NOSE GEAR LUBE. SEVERAL GEAR SWINGS PERFORMED. AIRCRAFT FOUND OK FOR SERVICE. (M)