As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LT ENG OIL PRESS WARNING WITH PRESSURE FLUCTUATING BETWEEN 23-31 PSI. THE FLIGHT RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED & REPLACED THE NR 1 ENGINE IDG CARBON SEAL. OIL PRESSURE, LEAK, AND CONSUMPTION CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.