As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE ON TAKE-OFF NOSE GEAR NOT LOCKED MAINS LOCKED / INTERROGATED MDC AND FOUND B1 CODE 007449. T/S IAW CRJ 900 FIM 32-21-00-810-802. CONFIRMED FAULT AND REPLACED PSEU IAW CRJ 900 AMM 32-61-01-000/400-801. POWER UP TEST GOOD. PERFORMED OPS CHECK OF LANDING GEAR EXTENSION/RETRACTION SYSTEM IAW CRJ 900 AMM 32-30-00-710-801. OPS CHECK GOOD. COULD NOT GET FAULT TO RECREATE.