Even without a manual, you know that's a temp sensor warning light. Common on these when the wires going to the drive motors get unplugged. Lift the mast high and block it. Check the wires going to the front of the motors. Replace any connectors that look corroded. You need a manual to proceed. That DRS switch could be up or down from some bonehead touching it. This truck will do tons of functions and checks on its own....with the switch up or down and toggling the shifter and lift arm. You need a manual