As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH FLT 7189 IAD-CLT. AIRCRAFT RETURNED TO THE FIELD DUE TO A "GEAR DISAGREE" AND "NOSE DOOR" WARNING MESSAGE ON CLIMB. BOTH MESSAGES EXTINGUISHED ABOUT 20 SECONDS AFTER GEAR RETRACTION. MX CLEANED PROX SENSORS PS18GA, PS19GA, PS4GA AND PS14GA AND PERFORMED GEAR SWINGS, OP CHECK GOOD.