What was found
ON FLIGHT 3583 (DTW TO LAN) AFTER TAKEOFF RETRACTED GEAR AND RECEIVED HYD 3 LO PRESS CAUTION AND GEAR DISAGREE MESSAGE. THE GEAR TOOK 45 SEC-1 MIN TO RETRACT WHICH TRIGGERED A GEAR DISAGREE WARNING HYD 3 QUANTITY AT 100%. NO EMERGENCY WAS DECLARED AND AIRCRAFT LANDED SAFELY. REMOVED AND REPLACED HYD SYSTEM 3 ACMP (BOTH A&B). ALSO REMOVED AND REPLACED NR 3A HYD CASE DRAIN FILTER. COMPLIED WITH PA 05-018J PER MOTR. SWUNG GEAR SEVERAL TIMES, ALL CHECKS GOOD. OPS CHECKS GOOD.