TIMS showed obstacle detected at EMU 3612 B1 door. SM (BGS) checked and confirmed B1 door did not op ened. Staff (BGS) tried to isolate defective train door at C TH station to no avail. SM (CTH) tried to isolate defective ~~~~~ * ,N * 'Checked and confirmed 3612 B1 door unable to open. From TIMS recorded FC-932 (Door operation timeout: OPE). During manual operation observed 3612 B1 LHS door jerky and intermittent unable to push open. Verified 3612 both LHS & RHS doors having 1pc outer roller damaged, replaced. Checked found manual isolation device unable to lock. Further check found isolation device plate deformed, replaced. Conduct door operation and manual door isolation smooth. Checked door leaf gap 64mm. DONE BY: KUMAR/SANKAR 09.07.2023 TIMS showed obstacle detected at EMU 361