As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR DISAGREE AFTER TAKEOFF. INSPECTED LANDING GEAR AND SENSORS, FOUND NOSE LANDING GEAR SENSORS DIRTY WITH DEBRIS. CLEANED SENSORS, OPS CHECKED LANDING GEAR IAW CRJ700 AMM 32-30-00, ALL INDICATIONS NORMAL AFTER RECYCLING LANDING GEAR NUMEROUS TIMES.