What was found
PDIS 749 26-12 3604 10OCT20 MEM FACT U. PASSING FL 200 ON CLIMB OUT, GOT MAIN DECK AFT SMOKE WARNING. WARNING STOPPED AFTER A FEW MINUTES. RETURNED TO MEM, NO EXTERIOR INDICATIONS ON GROUND FROM RESCUE ON SEAN. SHGN 10OCT20 23:39 MEM U. UPON INSPECTION, NO BITE DISPLAY MFA ON MX PANEL FOR MCD SMOKE DETECTION. LOOP A TESTS GOOD IN ALL AFT POSITIONS. COULD NOT GET LOOP B TO TEST IN POSITIONS AFT 1 AND AFT 2. PERFORMED TEST ON MCD AFT SMOKE DETECTION CONTROLLER, NO FAULTS NOTED. REQUIRES FURTHER T/S. FACT 11OCT20 08:32 MEM U. REMOVED AND REPLACED MCD AFT SMOKE DETECTORS 13WU THROUGH 20WU, REF AMM 26-19-13-04-09. REMOVED AND REPLACED 4 SMOKE DETECTOR INTAKE FILTERS FOR 13WU TO 20WU, REF AMM 26-19-13-04-09. ALL OPERATIONS CHECK GOOD. NO DEFECTS NOTED, REF WRI`S 26-12 3605 THROUGH 26-12 3614 FOR PARTS CHANGE INFO. A/C OK FOR SERVICE AT THIS TIME. FACT 11OCT20 08:32 MEM. REMOVED AND REPLACED MCD AFT SMOKE DETECTORS 13WU THROUGH 20WU, REF AMM 26-19-13-04-09. REMOVED AND REPLACED 4 SMOKE DETECTOR INTAKE FILTERS FOR 13WU TO 20WU, REF AMM 26-19-13-04-09. ALL OPERATIONS CHECK GOOD. NO DEFECTS NOTED, REF WRI'S 26-12 3605 THROUGH 26-12 3614 FOR PARTS CHANGE INFO.