Train doors at car 2665 door B4 were notproven closed. TC opened and closed once to clear fault. Fa ult did not recur at subsequent stations. ~~~~~ 2665 B4 Train doors were not proven closed. TC opened and closed once to clear fault. Fault did not recur at subsequent stations. Temp.25.2*. CE:Ac 1 vent fault lighted, car cooling.  2665 B4 door : CLE DOM registered. Checked no rubbing marks on door leaf & carbody external. Door leaf distance measure 64mm, door sensing device redline above criteria. Re-adjusted to within criteria. Swapped #2665 B4 DCP (S/N 1605W020011S037) with #2666 B4 DCP (S/N 1601W020001S010) for monitoring. Checked door J-rail - OK. Door resistance test - OK (7kg/f) Door guide checked - OK, no FOD. Door operation cyclic test - OK.  Au TK 44834