What was found
ON CLIMBOUT FROM MKE CREW NOTICED RUMBLE FROM NOSE AREA FOLLOWED BY A NOSE GEAR UNSAFE INDICATION. CREW DETERMINED NOSE GEAR HAD RELEASED FROM UPLOCK AND EXTENDED. CREW EXTENDED LANDING GEAR AND RETURNED TO MKE. LANDING WAS UNEVENTFUL. STERLING MAINTENANCE COMPLETED GEAR SWING AND FOUND UPLOCK ROLLER ON NOSE LANDING GEAR WAS BARELY ENGAGING UPLOCK HOOK. MAINTENANCE DETERMINED NOSE GEAR STRUT WAS NOT EXTENDING FULLY. WHEN CHECKING STRUT SERVICING MAINTENANCE FOUND HYDRAULIC FLUID IN THE NITROGEN SERVICE SIDE OF STRUT. MAINTENANCE DETERMINED AN INTERNAL SEAL HAD FAILED IN STRUT. MAINTENANCE REMOVED LANDING GEAR AND SENT OUT FOR INSPECTION/SEAL REPLACEMENT. ALL INTERNAL SEALS WERE REPLACED AND NOSE GEAR WAS REINSTALLED. GEAR SWING AND OPS CHECKS WERE GOOD.