As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF, FLIGHT RECEIVED CONFIGURATION LIGHT, RED, STATUS MESSAGE AND NOSE AIR GROUND DISAGREE WARNINGS. AN EMERGENCY WAS DECLARED AND THE FLIGHT RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. THE AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND COMPRESSED SENSOR DAMAGED AND REPLACED THE PROXIMITY SENSOR IAW AMM 32-09-08 AND ALSO PERFORMED SATISFACTORY OPERATIONAL CHECKS.