What was found
AFTER T/O, MLG DISAGREE MESSAGE ILLUMINATED WITH LT & RT MLG SHOWING UP & WHITE, NLG INDICATING RED HASH MARKED BOX. ACFT RETURNED TO DEPARTURE. EMERGENCY DECLARED. C/W FUNCTIONAL TEST OF NOSE WHEEL STEERING SYS IAW AMM 32-51-00. REMOVED NLG SHOCK STRUT ASSY, INSTALLED NLG SHOCK STRUT ASSY. INSTALLED NLG LT TRUNNION PIN, & INSTALLED NLG RT TRUNNION PIN IAW AMM 32-21-01. INSTALLED NLG SWIVEL ASSY TO GREASE INSERT & ELECTRO HYD MODULE, RECONNECTED NLG BOTTOM DRAG BRACE TO NLG SHOCK STRUT, RECONNECTED NLG EXTENSION/RETRACTION ACTUATOR ON NLG SHOCK STRUT. ATTACHED DISCONNECTED NLG CONTROL ROD TO NLG SHOCK STRUT. CONNECTED NLG ELECTRICAL CONNECTOR P62, P4GC, P63 & ALL RELECTED ELECTRICAL CONNECTORS ALL IAW AMM 32-21-01 . LUBRICATE NLG IAW AMM 12-20-32-640-801. PRESSURIZED SHOCK STRUT WITH NITROGEN IAW AMM 12-12-32. BLEED HYD SYS NR 3 IAW AMM 29-10-00. C/W FUNCTIONAL TEST OF THE EXTENSION & RETRACTION SYS REQUIRE IAW AMM 32-30-00. C/W FUNCTIONAL TEST OF NOSEWHEEL STEERING SYS REQUIRE IAW AMM 32-51-00 / RII C/W IAW GMM 3-3 FOR INSTALLATION RIGGING. OPS CHECKS NLG SHOCK STRUT ASSY.