Sieb,

135-3 is for fuel air pressure out of range high. Will need to check connector at sensor between pins b and c. Should read five volts. Pin a is the signal back to the ECU. Voltage should vary from.5 volts to 2.5 volts at the ECU. You can back probe the connector with the switch on and read the voltage.
524245-4 is for the operator presence system out of range low. This would prevent the engine from starting. That code is due to the wires that are cut. The black wire is a static ground. The red wire is a 5 volt supply, green is sensor ground and the yellow in the schematic, your white is sensor return. The switch is mounted under the seat. You should be able to repair wires and start lift. Good Luck.

Serialnumber: F813B02151F