error codes 5218 and 5219 deal with the lift and tilt proportional solenoid valve operation
according to the troubleshooting guide, check the wire harness between the lift and tilt proportional solenoid valves and the proportional solenoid valve controller.
First off, Check fuses, a 15A fuse according to manual could be causing the controller to fail.
If no problems found there then the proportional valve coils or harness may have open wire connection
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