Train doors were not proven closed. TC recycled train doors once - ok. Fault did not recur at subseq uent stations. ~~~~~ 3551-Train doors were not proven closed. TC recycled train doors once - ok. Fault did not recur at subsequent stations. CE checked 3551 All doors proven open and closed. OE request 3551 train door operational check.  551/552 checked all cars saloon doors for any FOD - OK. Door guide check - OK. Performed door gauge check/found #3552 B2, #2552 B1/A3 doors failed 10mm gauge test. Re-adjusted plunger & function test - OK.  Au TK 44761