As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE GOING THROUGH OUR PRE-FLIGHT WORK WITH THE MAIN CARGO DOOR OPEN, WE GOT A CARGO MAIN FIRE DETECTION WITH MASTER WARNING AND TWO STATUS MESSAGES: MAIN CARGO LOOP A AND MAIN CARGO LOOP B.(<P>PERFORMED FIRE SYSTEM FUNCTIONAL TEST IAW AMM 26-14-00, NO DEFECTS NOTED AT THIS TIME. OPS CHECK GOOD.</P>)