What was found
GEAR DISAGREE MSG ON TAKE OFF. QRH RETURN TO DTW. (FLT#4066) FILED CLOSEDTHIS DISCREPANCY WAS TRANSFERRED TO CAMP ITEM 19513752 WITH THE FOLLOWING CORRECTIVE ACTION: "TROUBLE SHOT GEAR DISAGREE , FOUND NLG STRUT BOTTOMED OUT AND LEAKING FLUID.REPACKED NLG STRUT IN REFERENCE TO CRJ 900 AMM. PERFORMED OPERATIONAL CHECK OF THE NLG STRUT, OPS CHECK(GEAR SWING / LEAK CHECK) GOOD AT THIS TIME.GEAR DISAGREE CAUTION MESSAGE NO LONGER PRESENT."