What was found
CARGO AFT FIRE DETECTION LOOP A IS INOPERATIVE. ACFT GROUNDED. COMFIRMED FAULT, AFT CARGO FIRE DETECTION SYSTEM A INOPERATIVE. PERFORMED TEST ON AFT CARGO ELECTRONIC UNIT- A1 FAULT. SLAVED NEW SMOKE DETECTOR A1, NO HELP. SLAVED NEW ELECTRONIC UNIT, NO HELP. IAW WDM: CHECKED FOR CONTINUITY ON WIRES BETWEEN D12776 AND D13844. FOUND TWO OPEN WIRES. REMOVED CONNECTOR D12778 FROM CEILING PANEL. CONNECTOR D13846 BECAME DISCONNECTED. SECURED THE CONNECTORS. CONTINUITY NORMAL. AFT CARGO FIRE DETECTION TEST PASSED.