As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4275 - AFTER TAKEOFF, THE LEFT ENGINE CHIP DETECTOR WARNING ILLUMINATED. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED DETECTOR AND GROUND RAN ENGINE PER GE CMM. ALL CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (M)