Code P0A94

Can anyone give me information on P0a94? I know it relates to the dc inverter. My Prius is a 2007 with HIGH miles. 397,000. Engine/trans replaced myself 15,000 ago. Vehicle has been running fantastic. Today the engine shut off with multiple dash lights....red triangle included. I mean running great one second, and dead the next. Boom...gone. Reset multiple times, same result. Where to look first, second, third???

Thanks!