TC reported TIMS showed "obstacle detected" at FDT and EB tripped. Reset EB - ok ~~~~~ 3555 TC reported TIMS showed "obstacle detected" and EB tripped. Reset EB - OK. Download ER and Fault Code & send to OE TAN.  3555 obstacle detector clearance for both A/s & B/s checked - OK. Swopped 'Fire Detection Power' unit to 1555. Awaiting Obstacle Detector Relay change-out. OPS 20 raised to follow-up.  Chan SW/Hanafi 44018 3555 - To replace ODR.  3555 Obstacle Detector Relay(ODR) replaced as preventive measure . Checked both A/s & B/s obstacle contact s/w - OK. Function test - OK. Also checked 3556 wheel diameter reading & Tacho ohm reading - OK. Limited movement - OK.  Selvan/Lee PT 44018