As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR EXTENSION, RECEIVED ONE GREEN LIGHT ON LEFT MAIN GEAR ONLY. RETRACTED GEAR AND RECEIVED THREE RED LIGHTS. RE-EXTENDED GEAR AND RECEIVED NORMAL INDICATIONS. FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED DEBRIS FROM LEFT MAIN INDICATOR LOWER SOCKET AND RELAMPED, GEAR SWING AND OPERATIONAL CHECK GOOD.