I repair forklifts for a living. I’d never buy from the dealer. Linde cam belts are supposed to be changed every 3000 hours anyway. One of the best trucks you can get.
The Linde truck controller is detecting incompatible values from the brake switches (1S1 & S2) on the brake valve. 1. You may have a defective brake switch or switches. These are the little micro switches under the floor board and attached to the brake valve by the hydraulic tank. 2. The wiring and/or the connections from the brake switch going to the truck controller may be defective.
