As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1215 - EN ROUTE BOS-ORD 0 DURING CRUISE LEFT LANDING GEAR DOWN LOCKED LIGHT ILLUMINATED WITH HANDLE IN THE UP POSITION. LANDED ORD WITHOUT INCIDENT. REMOVED DEBRIS FROM LANDING GEAR INDICATION LAMPS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)