As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CARGO FIRE LIGHT DOES NOT ILLUMINATE DURING TEST WITH DETECTOR SWITCH IN NORMAL. TESTS OK IN THE "A" POSITION. PERFORMED FIM TASK 26 16 00 810 804 FOUND FAULT ON SMOKE DETECTOR B1. REMOVED AND REPLACED B1 SMOKE DETECTOR PER M/M 26 16 01. OPS CHECK GOOD.