What was found
AFTER TAKEOFF ON FLIGHT 4089, FROM YOW TO DTW, WHEN GEAR LEVER MOVED TO UP POSITION WE RECEIVED FIRST A HYDRAULICS 3 LOW PRESS CAUTION. THEN RECEIVED NOSE DOOR OPEN AND GEAR DISAGREE WARNING WITH BOTH MAIN GEAR INDICATING DISAGREE. AFTER 3-5 MINUTES ALL GEAR RETRACTED/NOSE DOOR CLOSED AND ALL CAUTIONS WARNINGS CLEARED. FLIGHT CONTINUED TO DTW AND LANDED WITHOUT FURTHER INCIDENT. COMPLIED WITH PA 05-018 REV H SCENARIO 2. COMPLIED WITH PA 05-018H STEPS 1-9. COMPLIED WITH PA 05-018H STEPS 10-21 IAW. REMOVED AND REPLACED MAIN LANDING GEAR PRIORITY VALVE IAW AMM 32-33-15. OPS CHECK GOOD. REMOVED AND REPLACED HYDRAULICS NR 3 RESERVOIR IAW AMM 29-12-30. LEAK CHECK GOOD.