As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWENTY MINUTES AFTER TAKEOFF, CREW WAS ALERTED BY A NR 1 ENGINE ''OIL'' LIGHT ON MASTER CAUTION PANEL. OIL PRESSURE WAS NORMAL. AIRCRAFT RETURNED TO HOME BASE (MMU). ENGINE CHIP DETECTOR INSPECTION REVEALED A CHIP ABOUT .1250 INCH LONG. DRAINED OIL FROM GEARBOX AND FOUND CHIPS IN OIL. SOAP SAMPLE TAKEN, FOUND NORMAL. CHIPS ANALYSED AND FOUND COMING FROM AIRFOIL SEPARATOR. SEPARATOR REPLACED. (X)