Brother GTX pro Instruction Manual page 281

(12) Insert the flat cable into the core and connect it to the carriage board.
(13) Fit the claw by pushing the core until it clicks into place.
Leave a slack to avoid interference between the flat cable and the resin cover.
(14) Place the resin cover back onto the carriage board, and engage the two latches properly.
Tuck the extra flat cable as shown in the illustration.
(15) Remove the cap you connected in step (6) from the tube, and connect the tubes to the print head.
<IMPORTANT>

To prevent the tubes from being entangled with each other, connect the innermost tube to the print head first, and make a
connection of the rest of the tubes.

Be sure to connect each tube with its correct position.
Core
Flat cable
Latch
281
Troubleshooting
Resin cover
X0404
X0405