As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DECK FIRE WARNING, MASTER WARNING AND FIRE BELL ON TAKEOFF ROLL. REJECTED TAKEOFF. FIRE BELL CONTINUED TO SOUND AFTER SILENCED. - NO FIRE PRESENT. DISCOVERED MOISTURE IN CARD FILE M5206 CAUSED BY PALLETS BEING LOADED WET AND WATER DRIPPING INTO THE ELECTRICAL AND ELECTRONICS BAY. CLEANED MOISTURE FROM CARD FILE M5206. FIRE MAIN DECK FIRE WARNING EXTINGUISHED. TESTS NORMAL.