TC feedback DIR illuminate however all HHPSD and train doors were proven closed. TC open and close b oth side of FDT cab doors but to no avail. TC operated DIRBSand proceed in ATPM back to UPD. ~~~~~ 3562 TC feedback DIR illuminate however all HHPSD and train doors were proven closed. TC open and close both side of FDT cab doors but to no avail. TC operated DIRBS and proceed in ATPM back to UPD.  3561  found B/S cab door double latch loose and not secured. Realign and retigthened. Function check ok. No DIR litted, door proven closed.  Sarma/Lee PT 45218