What was found
AFTER TAKEOFF AT GEAR UP, GOT GEAR DISAGREE & GEAR DOOR OPEN WARNINGS. RAN THE QRH FOR GEAR DOOR OPEN & ALL LG SHOWED DOWN & LOCKED. RETURNED & DID NOT LAND OVERWEIGHT. WHEN WE GOT THE WARNINGS THE NOSE GEAR SHOWED DOWN & LOCKED, THE MAINS SHOWED YELLOW. NLG STRUT COMPLETELY FLAT. IAW NRWC 529784 FOR REPAIR OF NOSE STRUT ASSEMBLY. LG EXTENSION & RETRACTION OPERATIONS CHECKED GOOD IAW AMM 32-30-00, AFTER STRUT WAS REPAIRED, SEE ALSO NRWC 531421 & NRCC FOR DETAILS.