Front DT car 'A1' train door was not proven closed. TC isolated front DT car 'A1' train doors in clo sed. ~~~~~ 3664 Front DT car 'A1' train door was not proven closed. TC isolated front DT car 'A1' train doors in closed.  3664 A1 door isolation mechanism platefound slightly bent.Re-aligned the mechanism & swopped the micro s/w to 1664 A1 door. Function test & cyclic test 20 times - oK.  Selvan/Lee PT/Alcus 43896