This post is for informational purposes only, please review the manufacturer datasheet for any suggested parts to confirm that they are suited to your application.
FK10KM-10 is an N-channel MOSFET that was previously produced by Mitsubishi. Based on the information found in a copy of the old datasheet (linked here), part number 4786-GSFU60R360-ND from Good-Ark Semiconductor should be a good fit for replacement.
Here’s the datasheet for the replacement part so you can compare and confirm whether it’s suitable for your application: GSFU60R360 Datasheet