DIR remained illuminated after train doors proven closed. TC open and close train doors a few times to no avail. TC also open and closed front DT car both sidescab door but fault remained. TC operated ADBS also to no av  ~~~~~ TO inspect other doors L3 Inspect Other Doors Lock Nut - OK Selvan/Lee PT 43941 L3 3540 B4 Door Close Detection Switch Actuator Lock nut Drifted. Adjusted & Apply Torque Seal. Cyclic Test Door Operation - OK. Checked Indication - OK. Resealed ADBS. HAnafi/Chan SW. 20/04/20.