As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RAISING GEAR AFTER TAKEOFF, WE HAD GEAR DISAGREE WARNING MSG AND NOSE DOOR OPEN WARNING MSG. C/W QRH AND LANDED IN CHS. MAIN GEAR RETRACTED NORMALLY, NOSE GEAR REMAINED DOWN. ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED, ARFF RESPONDED ADJUSTED NLG OLEO CENTERED / EXTENDED PROXIMITY SENSOR IAW AMM 32-61-05. OP'S CHECK GOOD.