DIR permanently illuminated when approaching BDK EB. At BDK EB after pax exchange train fail to depa rt due to DIR permanently illuminated. Recycle train door an d cab door once to no available.TC disembark passenger at ~~~~~ Open Close speed pass: Y FOD found: Yes, found large button lodged at 1501 B2 door guide rail. Door cycle 20x: Y Rubbing marks: N Do 10/20mm gauge test - 3502 A3 and 2502 B3 failed. Check manifold and actuator for any air leak -  no leak Check EMV for any residue voltage when door close - no residual voltage. Door manual force check- ok Rectification Actions: Removed FOD at 1502 B2 door guide rail. Adjusted 3502 A3 and 2502 B3 accordingly. Function tested ok. Door opening and closing speeds were in-sync. Resealed ADBS and DIRBS at normalised position. open.close speed pese-yes FOD found:yes (1501 B2 door) door cyclelok-yes rubbing mark:no    10/20mm gauge test-yes manifold and acyuator-no leak no residue voltage when door close door manual force check-ok N.A/kwok/husin/21.01.23