As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 421 - LT ENGINE CHIP LIGHT ILLUMINATED WHILE TAXIING. AIRCRAFT RETURNED TO HANGER. THE CHIP DETECTOR WAS CLEANED AND PENALTY RUN PERFORMED. THE CHIP DETECTOR WAS REINSPECTED AND ALL INDICATIONS WERE NORMAL. THE AIRCRAFT WAS RELEASED. (W)