TC feedback marker light was blinking when train was in ATPM mode. ~~~~~ 3555 TC feedback marker light was blinking when train was in ATPM mode.  FNFReplace flashing device but no available. Ops20 to follow up further check. Done By:Luke/Sanip Date:10-07-2024 To follow further check on ATC marker light.  3555 Check and found marker light faulty (ingress with water). Replaced marker light & function check - ok.  Sarma/Alan/Lee PT 45486