As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE ON TAKEOFF. GEAR RETRACTION SOUNDED LIKE IT TOOK LONGER THAN NORMAL. MESSAGE CLEARED BY ITSELF AND EXTENDED NORMALLY ON LANDING. (FLT#5147) FO: 03/06/2019 CLOSED SECURED B NUT ON HYDRAULIC LINE, BLED HYDRAULIC SYSTEM AND PERFORMED GEAR EXTENSIONS/RETRACTIONS IAW AMM. NO DISCREPANCIES NOTED. OPS CHECK GOOD.