L111 Fuse Blows when Turning Off Engine

Hi everyone, I’ve been having a strange issue recently with my L111 mower. It starts up and runs fine, however occasionally as soon as I turn the key to the off position, the main 15 amp fuse blows. Sometimes it does this, other times not. The blades are off, the parking brake on, and the engine idling every time I turn it off.

If I replace the fuse, it starts right back up and continues to run with no issues. The fuse holder shows signs of overheating at some point with some of the plastic deformed near the terminals. I just can’t figure what would be shorting or causing an over current when turning it off.

Any ideas where to start with this one?

Thank you!
Aidan