As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ENGINE 1 OIL QUANTITY INDICATOR SHOWS XX. FLIGHT RETURNED TO FIELD AT PHX AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED CONNECTOR WIRING AND PINS. NO DEFECTS NOTED. FOUND ENGINE 1 OVERSERVICED WITH OIL. REMOVED 2 GALLONS OF OIL. REMOVED AND REPLACED OIL QUANTITY TRANSMITTER AS PRECAUTION REF AMM 79-31-15. INDICATION OPS GOOD. ENGINE 1 HAD NO FUEL SMELL IN OIL.