TC reported DIR kept blinking. No DMI. Station staff(RFP) checked and confirmed all train doors -ok. ~~~~~ TC reported DIR kept blinking. No DMI. S   ER downloaded. Fault unable to duplicate in depot. Checked all saloon doors sensing switch, OK. Checked cab doors sensing switch, OK. Checked detrainment door, OK. Preventively replaced DLR and COR6 @ 3551 and COR6 @ 3552. For further monitoring. N.A LAI M.K./10.12.21