TIMS showed obstacle detected at rear DTcar B3 train doors while the doors were open. Staff (KTB) c hecked and confirmed no abnormalities. ~~~~~ 3627 ER, Trace Record & Isolation record D/L - Done. No fault found recorded on #3627 doors. Checked #3627 B3 door guide & door leaf for any FOD - OK. Weather strip checked - OK. Cleaned all 4 pairs of #3627 B/s saloon doors J-rails. Function checked door operation - OK.  Au TK. 10/10/2020.