This past weekend, while performing the standard 10 hour break-in period for our new boat, the engine Malibu Monsoon M6DI just sputtered out and the engine cut in the middle of the lake. We were around ~8 engine hours and everything was working totally fine until the engine shut-off. We weren't pushing the engine hard, besides 15 minutes to make sure the wedge, surf gates, and PnP ballasts worked the day before. When we took it out the following day, it started up just fine on the lift, and we were casually cruising around the lake when it stopped. Currently the boat battery will turn on like normal, automatically run the blower for 3 minutes, and start up process like usual. There are NO engine codes or alarms on the HMI which is where I'm stuck.
When I click the start/stop button, you can hear the engine crank and attempt to start but it wont actually start the engine (the belt just keeps spinning without turning on the engine). Even after releasing the start/stop button after a second it will continue to try to start the engine to no avail and keep revving. The only way I can get it to stop cranking is to manually turn the battery off, otherwise it would just keep trying to start the engine. From my limited engine/electronics knowledge, I'm having a hard time pin-pointing what could go wrong because it's clearly getting power from the battery to turn the crank, but something between clicking the start button to actually getting the pistons to rev isn't working.
I'm struggling to diagnose and will take it to the dealership to fix this week, but was hoping for any quick advice here. I'm most confused because everything seems to working normally from a battery, fuel, oil perspective. The ignition/The engine will spin, but just not fully turn over. If anything I thought I would've seen problems when we checked to confirm the wedge, surf gates, etc. were working at slightly higher RPM, but that worked perfectly.
Things I've Checked:
It still has plenty of oil
Batteries ~14.5V
Engine is getting fuel
Boat is in Neutral
Hoping someone on here has witnessed the same and can help!