As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD-BWI - FLT 6468 - DURING TAXI, EXPERIENCED A LEFT FIRE DETECT LIGHT ILLUMINATION. AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE FOUND WATER INGESTION IN THE ELEMENT CONNECTOR. MAINTENANCE CLEANED ELEMENT CONNECTOR AND PERFORMED APPROPRIATE CHECKS. AIRCRAFT WAS THEN RELEASED FOR SERVICE. (M)