p3004 sc 131 cracked 12v post, blown service plug fuse, no start

Owner brought me 2005 Prius. Diagnosed it to have misfire #3. Replaced broken spark plug and coil pack. P0a80 code. Several bad cells. I rebuilt hv pack with cells from a 2014 traction battery. Customer drove for a few weeks and reports that now car will barely move. I tow it back. Ready light comes on for 5 secs and then turns off with no start. Find that the auxiliary battery has a bent cracked positive post. Replaced the battery but the service plug fuse was blown (yes, the big hairy one) I replaced service plug with one from my past battery rebuilds. Car drives fine for 10 miles but after I parked it and came back out the next morning no start. Same symptoms as before but service plug is fine. What the? Ready light comes on for 5 secs, then goes off and the red triangle comes on with no start. DTC p3004 with subcode 131. I really thought it fried the inverter dc-dc converter and just decided to replace the inverter but no luck. Getting ready to pull the traction battery and probably just replace the relays and/or resistor with some form old batteries. Yes, I've got lots of battery parts. Anyone have suggestions on what you would do? I have mini VCI. Never seen this subcode before on all of the Prius's I've done.

 

Guess I never mentioned the outcome of this issue. (I hate it when people neglect to do that) We removed the case from the battery and found a mess. The positive cable of the hv battery was fried and disconnected from the bolt-down connection. Relays were melted somewhat as well. Since we had cores we replaced all of that including the computer. Ran perfect ever since. My son actually did this replacement and my thoughts are that he didn't double check to make sure that the cable was bolted tight which heated everything up. This could have been alot worse then it was. I'm just glad it didn't catch on fire or injure someone. Thanks for the replys.