are you sure of the serial number?
5NR3440700.
would be a nr4000, should be a 36 volt truck, with a ZAPI controllers, made in 2004,
to me a code 35 says it is an overcurrent in pump1
to me, since you feel it is related to direction of traction travel, I would be closely checking the ribbon cables inside the pump inverter, and the wires to the pump inverter.
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