Hayward Matrix Power Flo Pump issue

Hey all. My pump cord got water on it and I guess shorted out, it burnt the 2 prongs to a crisp. Brought to Leslies as they had the cord in stock.  Guy called me this morning saying the bolt that holds the cap on the motor is seized, stuck, etc. He says he put anti seize on it and left it overnight & still no luck.  Any ideas or products that might help get that bolt off?  I really don’t want to spend 2-300 on a new pump because of a bolt…