As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1021 - AFTER TAKEOFF UPON GEAR RETRACTION, RED LEFT GEAR WARNING LIGHT REMAINED ILLUMINATED. ALL OTHER INDICATIONS AND FUNCTIONS NORMAL. JACKED AIRCRAFT, OPERATED GEAR SEVERAL TIMES. UNABLE TO DUPLICATE PROBLEM. REPLACED LANDING GEAR ACCESSORY UNIT AS PRECAUTION. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)