Gen 3 with C1259 C1310 and P0A94 codes

Hi guys

I'm asking this for a friend, who also like me purchased a Prius from code clearing dude ( different to the guy i got it mine from)

Toyota scanned the car for him and got:
"C1259 HV control system regenerative malfunction
C1310 HV system malfunction
P0A94 Converter performance "

They told him we don't know what's causing these codes they need to contact Japan and might need to do further diagnostics. He thinks they know but want to milk it.

Reading threads here things to check would be:

1) 12V battery
2)Inverter water pump
3)Wiring on the HV battery ( he thinks battery may have been replaced once)
4)Inverter?

Thanks for in advance