As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RADAR WAS MAKING A GRINDING SOUND WHEN CHANGING TILT. CREW ELECTED TO RETURN TO CLT AND LANDED WITHOUT INCIDENT. MINTENANCE REMOVED AND REPLACED THE RADAR ANTENNA. MAINTENANCE TROUBLESHOT, REMOVED, REPLACED, AND OPERATIONAL CHECKED THE RADAR ANTENNA USING AIRCRAFT MANUALS.