Fujitsu AR 18LUAD Series Service Instruction page 142

Remove the 1 mounting screw.
Remove the INVERTER BOX COVER upward.
Remove the connector and cords.
CN1 (Black/Brown/Red)
W6 (Black)
F
E
Twist W6 and W7
4 times or more.
W7 (White)
VIEW - E
10-13
INVERTER BOX COVER
Hook (2 places)
Twist W4 and W5
2 times or more.
W5 (White) W4 (Black)