What was found
ON CLIMB, LANDING GEAR RETRACTED. ECAM DISPLAYED LANDING GEAR RETRACTION FAULT. SELECTED POSITION DET 1 AND 2 GEAR RETRACTION FAULT REMAINED. FLAPS WOULD NOT RETRACT, STAYED AT 15/20, ONCE LANDING GEAR DOWN ALL FLAP OPERATION RETURNED TO NORMAL. LOST ALL AUTOMATION ON GEAR RETRACTION RETURNED TO NORMAL WITH GEAR EXTENSION. JACKED ACFT AND FOUND NLG TARGETS MISALIGNED IAW MM 32-00-00-04. UPON FURTHER INSPECTION FOUND NLG NITROGEN COMPLETLY DEPLETED. DOWN JACKED ACFT AND SERVICED NLG STRUT IAW AMM 12-12-32-0. GEAR OPERATIONAL TEST GOOD IAW AMM 32-31-00-5.