TC reported DIR intermittent light up when in between stations. No abnormalities was found. ~~~~~ TC reported DIR intermittent light up wh   ER confirmed DIR intermittently lighted up. Fault can intermittently be duplicated in depot. While shunting into pit, staff saw DMI intermittently lighted. Checked and found 3552 A-side cab door slight gap between plunger and door close switch. Adjusted the cab door close switch and plunger. Checked and found all saloon door switch fully    depressed when closed, OK. Checked and shook all 52 door wirings, confirmed no DIR illumination when wire being shook, OK. Checked TLSK and grounding line, OK. N.A FAIRUZ/FAIZAL/SHARI /14.12.21