As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR EXTENSION GOT A GEAR DISAGREE AND TOWER CONFIRMED THAT THE NOSE GEAR WAS STILL UP. PERFORMED MANUAL RELEASE GEAR EXTENSION AND RECEIVED THREE GREEN INDICATIONS. REPLACED NLG SELECTOR VALVE ASSY IAW CRJ 200 MM 32-33-10. OPERATIONAL CHECKS GOOD.