What was found
"CRG FIRE LWR AFT" LEVEL 3 ALERT AND AURAL WARNING ON TAKEOFF ROLL. ABORTED TAKEOFF AND DISCHARGED BOTH FIRE BOTTLES. PERFORMED AFT AND FWD CARGO COMPT INSPECTION, NO DAMAGED OR FIRE CONDITION FOUND. VERIFY WITH FLT CREW THAT THEY DISCHARGED AGENT 1 (THE BIG BOTTLE) ONLY. MSC FAULT REVIEW SHOWN 'MSC' NO OTHER RELATED FAULT. REMOVED AGENT 1 FIRE BOTTLE PER AMM 26-22-01-4 AND FOUND P1-2286 CONNECTOR BROKEN OFF. SUPP, R & R LOWER CARGO FIRE EXTINGUISHER CONTAINER NR 1 PER MM 26-22-01-4, FOUND FWD & AFT AGENT 1 LOW PRESS LIGHT ON. T/S FIM 26-22-01 FOUND LOW PRESS SWITH AT FAULT ,PRESSURE SWITCH PIN "A" & "B" IN CLOSED.