What was found
AFTER TAKEOFF, MLG CAME UP & NLG STAYED DOWN. CONFIRMED BY TOWER. PUT HANDLE DOWN & BOTH MLG CAME DOWN. LANDED NORMAL. TURNED NOSE WHEEL LT & RT, CYCLED GEAR TO CHECK NOSE WHEEL CENTERING. PERFORMED 10 CENTERING CYCLES & DURING 1 CYCLE WHEEL CENTERED BUT NLG DID NOT RETRACT. PERFORMED STEERING UNIT FREE PLAY CHECK IAW MM 32-20-00 REV41, FREE PLAY IS LESS THAN 1.5 DEGREES IN 1 DIRECTION AT 3 DEGREES TOTAL. CHECKED NLG ACTUATOR RELEASE PRESSURE. NLG ACTUATOR RELEASED AT 1200-1300 PSI. REMOVED NLG STEERING UNIT. INSTALLED REPLACEMENT STEERING UNIT IN REF MM 32-50-00, REV 41. RIGGED UNIT IAW MM 32-50-00, REV 41, PERFORMED GEAR SWING & BLEED UNIT. OPS CHECKED GOOD.