ATS alarm showed 'Train door 0 status lost while train is moving' and 'CBTC applied EB due to train doors opened while moving.' at track circuit N775. Train EB was applied while departing station in Auto mode. Released E ~~~~~ 555/556 ATS alarm showed 'Train door 0 status lost while train is moving' and 'CBTC applied EB due to train doors opened while moving.' at track circuit N775. Train EB was applied while departing station in Auto mode. CE:3555 no Recurrence Of EB applied during monitoring OE depot check.  555/556 ER D/L & found no EB applied or DIR dropped. Checked with SIG LDC & ATS, no abnormalities/FC. Checked saloon doors for any FOD - Not found. Door cyclic test & DIR able to extinguish. Checked cab door freeplay - OK. Performed cab door mod as per FW MRC. Adjusted cab door tongue latch gap (1 to 3mm). Adjusted door plunger 0mm & 2 turns for sensing s/w positive latching. Depot shunting & no abnormalities found.  Lee JC 44838