CE reported 1536 #1 bogie, Under B1 Door ~~~~~ CE reported 1536 #1 bogie, Under B1 Door slight knocking sound Undercarriage.  1536 #1E gangway footplate found sinking. Adjusted the gangway footplate to normal position. Checked gangway no tilt & side panel within criteria. Function check footplate - OK. Checked underframe no damages. Depot shunting, no abnormalities.  Alan/Lee PT/Kamal/Shafie 44705