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Lexus GS450H Hybrid battery trouble


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Hi all,
Lexus GS450H hybrid Battery trouble.
So I’ve spent time this year rebuilding my faulty hybrid Battery (not a job I’d recommend doing as a DIY - give it to an expert!)
Battery rebuilt and back in the car. Had a temp sensor fault and service plug/ isolator fault which are now both fixed.
I am not getting a fault code P3004-131. I’m not sure what it is but I see here that someone had a similar issue.
"When I try to start the car I hear a click coming from the trunk and the ready light would flash for two seconds and then it would just go away"
I have this same thing. The dashboard flashes ready twice but still the car won’t start.
What is the GS450H equivalent of the part replaced in the link above and how do I change it??
Thank you.
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