As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT FLIGHT# 3187 THE CREW REPORTED DURING CLIMB AFTER SLECTING GEAR UP THEY HEARD A LOUD RUMBLEIN THE NOSE SECTION.THE AIRCRAFT RETURNED AND LANDED WITHOUT FURTHER INCIDENT.MAINTENANCE INSPECTED AND FOUND THE NOSE GEAR DOORS DID NOT CLOSE.THE NOSE GEAR UPLOCK PROXIMITY SENSOR WAS REPLACED AND OPERATIONAL CHECKS WERE GOOD.