What was found
AIR RETURNED DTW DUE TO GEAR DISAGREE & ASSOC, HYD 3 LO PRESS, MSG, NON-EMERGENCY. AFTER TAKEOFF WE GOT A HYD 3 LO PRESS CAUTION MESSAGE. SOON THEREAFTER, WE GOT GEAR DISAGREE WARNING MESSAGE WITH ALL THREE BOXES IN RED. AFTER THE HYD 3 MESSAGE WENT AWAY ON ITS OWN, THE GEAR CAME UP AS WELL ON ITS OWN. COMPLIED WITH PA 05-018K SCENARIO NR 1. R&R NR 3 HYD BRAKE ACCUMULATOR IAW AMM 32-43-16. BLEED HYD SYS NR 3 IAW AMM 29-10-00. PERFORMED GEAR SWING IAW AMM 32-30-00, OK FOR SERVICE.