EB applied departing station. TC reset EB - ok. TC feedback DIR illuminated and extinguished once. F ault did not recur at subsequent stations. ~~~~~ 3501 -EB applied departing station. TC reset EB - ok. TC feedback DIR illuminated and extinguished once. Fault did not recur at subsequent stations.   No FC found on TIMS. From ER saw EB occurred once just as train was departing station. EB did not recur after that. Further check found #3501 B side cab door double latch was loose with one bolt missing. The double latch was attached too far backwards (towards the rear cab). Readjusted the double latch and replaced the missing bolt. Rigging was done and latch overlap was satis. Function check and security check ok. DIR/DMI able to extinguish. Further checked all cab doors latching were ok. Cyclic test and static test was satis with no abnormalities to DIR/DMI indication during cyclic test. Luke 45119