TC reported while changed end, gangway floor lower between rear M2 and rear M1 car. Staff (MRB) chec ked and confirmed. ~~~~~ 2528/1528 TC reported gangway foot plate lower between car. Staff (MRB) checked and confirmed.  1528 & #2528 gangway floorre-adjusted to achieve 3mm gap. Security check - OK.  Fazly/Faiz 44888