TC reported Internal Smoke Pre-Alarm 2 in FM2 car. Staff (NEW) checked and feedback no sign of smoke . ~~~~~ TC reported Internal Smoke Pre-Alarm 2 i     #2720 Fault code 771/774. Cleaned #2720-no 1 end sensor and swapped to #1720-#2 end. And also cleaned-no 2 and swapped to #2719-#2 end. Monitor for 2 hours no reoccurance of fault.To monitor further. Done by Haslan/Saini/Arsuddin. 03/9/20