As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX INFLIGHT T1943/18DEC - RECEIVED AFT CARGO FIRE INDICATION. DISCHARGED FIRE BOTTLE AND AIR INTERRUPTED TO BFL. LANDED WITHOUT INCIDENT. NO SIGN OF FIRE IN CARGO AREA. FOUND CARGO ELECTRONIC UNIT WET AND DRIPPING WATER AND SHORTING. CHECKED FOR WATER LEAK AND REPLACED CARGO ELECTRONIC UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION.