As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS MESSAGE DETECTOR FAN 1 CARGO FORWARD SHOWED AT DEP. MAINT MESSAGE 26-21041 MAT TEST FAIL PER FIM 26-16 TASK 803. MSG DET FAN 1 CGO FWD NOT DISPLAYED ON EICAS, NO EXISTING OR INBD FLIGHT FAULTS. ACCOMPLISHED GROUND TEST 26 CARGO SMOKE DET SYS TEST PER FIM 26-16 TASK 803, TEST PASSED, CARGO SMOKE DET SYS CHECKS OKAY.