As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CARGO FIRE TEST AFT LIGHT WASN’T ILLUMINATED. GROUNDED YES. FOUND LOOP B2 FAULTED. CLEANED WITH AIR ALL B LOOPS. PLACED SELECTOR TO BOTH AND TESTED CARGO SMOKE DETECTION OPS TEST PASS REF MM 26 16 01 100 801 AND 26 16 00 710 801.