ECB activated in Front M2 A3 car. Staff(MSL) confirmed there is no incident and reset ECB for train to depart. ASM (MSL) subsequently informed the ECB button wa s dislodged when they were trying to reset the ECB. IMDC (CO ~~~~~ Check #2555 ECB at A3 door ok. But found ECB at A4 dislodged. Replaced done & function test ok. Done by Haffiz. 24/02/21.