TC reported TIMS showed that one pair oftrain doors failed to open at FDT A1 door. Staff (NEW) conf irmed and pasted faulty door sticker. ~~~~~ #3640-A1-FC 021/022 show. Found #3640-A1 saloon door locking device dislodged. Replaced 1 whole set door locking device. Door cyclic check ok. Push pull-left door: 5.8kg, right door: 6kg. Mating door: Top - 64.1 and bottom - 63.1. New: C151BDL156087. Old: C151BDL156060. Not: 2183779 raised to RSW. Done by Koh/Zulqarnain. 27/07/20.