As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WATER LEAKING FROM BELLY UNDERNEATH FWD CARGO AREA. FOUND HUMIDIFIER WATER DRAIN RELIEF VALVE LINE ACCUMULATED WITH ICE BLOCKS ON BILGE AREA. SUSPECT AIRPLANE WATER DRAIN LINE BLOCKED, ALLOWING RELIEF VALVE TO OPEN AND OVERFLOW WATER THROUGH RELIEF LINE. REF MM 21-71-00 PG 5, ITEM 2(8) AND MM 21-71-09 PG 402, FIG A. DRAIN CLOGGED.