Got to work on the truck today. Checked the wiring. Faulty wires in the area of connector X22 which is inbetween the wiring from B129 to T1 were causing the issue. Fixed the wires, truck works fine now.

Thanks for your advise!

2:184 Signal from B129
Signal from B129 despite open
main contactor
No test signal from B129 to T1
when it is energised.
Truck behaviour
Creep speed, blocked lifting/
lowering movement
* Defective component
B129
* Broken wiring
1) Check the height sensor
B129
Check that B129 is securely fastened.
Check that the magnet is
in place. If not, install a
new one.
If the magnet is in place:
Check that the lateral
distance and the distance between the
sensor and the magnet
is OK.
Perform the test of B129
TruckCom or Service Information mode 9. Low
signal = actuated sensor;
High signal = unactuated
sensor
2) Check wiring after the
break.
Disconnect the battery
Using instruments, check
that there is no break in
any wire.
Measure and check the
voltage with the functions activated