Brother GTX pro Instruction Manual page 305

(8) Remove the wiper from the maintenance unit.
<IMPORTANT>

There are two protruded parts underneath. Thoroughly remove the wiper not to damage these parts.
(9) Insert a new wiper into the printer from above.
Wiper
Wiper
305
Troubleshooting
Wiper
Protrusion Protrusion
X0440
X0441