TC reported Internal Smoke Pre-Alarm 2 in Rear M2 car. Staff (YCK) checked and feedback no sign of s moke. ~~~~~ TC reported Internal Smoke Pre-Alarm 2 i     #2714 fault code 774-internal smoke #2 end the alarm. Clean the pre-alarm smoke detector pin with contact cleaner.Air blow pre-alarm smoke detector.Reconnect and function check ok.Check on Tims no re-occurance of fault.To be monitor at M/L. Done by Zulqarnain/Saini/Din. 13/04/20