Case 440 – Lights went out and now unit won’t crank

Hello all, new member and novice operator. Was doing some light work at my place with the lights on. They went out and then the unit went into park automatically. I turn off the parking brake press the lights on button, and it goes back into park with no lights on. I tried this a few times. Best I can figure is it’s some sort of safety feature? I drive back to my house, turn it off. Then I try to restart it and now the unit won’t start at all. Won’t crank. I checked all fuses with an ohm meter. I verified the bulbs lamps work on a separate battery. All good. So I have a dead piece of equipment. I have a few generic 40a relays and swapped some of those in as well. No change. What can I try next? Is there a source for a service manual and wiring diagrams?