As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CARGO FIRE DET SYS INOP, FLT DIVERTED. OFF-LOADED CARGO FROM FWD PIT. DISCONNECTED TUBING AT SMOKE DETECTOR, CAPPED OFF MOST OF SAMPLING PORTS FOR ZONE 3 USING TAPE & UTILIZED LOW PRESSURE COMPRESSED AIR TO BLOW OUT TUBING FROM DETECTOR OUT TO SAMPLING PORTS. MAT TEST PASSED AND MX PAGE SHOWED FLOW NORMAL.