As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DECK CARGO SMOKE DETECTOR NR 5 LIGHT ILLUMINATED IN FLIGHT, LIGHT EXTINGUISHED BY PRESS DETECTOR TEST "B" BUTTON (NO SMOKE NOTED). REMOVED NR 5 B MAIN DECK SMOKE DETECTOR, CHECKED FOR LOOSE AND DAMAGED WIRES, RE-INSTALLED SAME SMOKE DETECTOR 5B IAW 747 MM 26-14-01. OPS CHECK SEVERAL TIMES, NO DEFECTS FOUND, OPS CHECK GOOD.