As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED ANTISKID INBOARD MESSAGE FOLLOWED BY PARK BRAKE SOV AND ALL GEARS FAILED TO RETRACT. APPROXIMATELY A FEW MINUTES LATER ALL GEAR RETRACTED. (FLT 5597) REPLACED LANDING GEAR SELECTOR HANDLE ASSEMBLY PER CRJ AMM. P/N 601R50967-11, S/N OFF: 1498.