Hey Bill how are you
You will need a Factory scanner or equivalent to be able to read the Hybrid module & anti theft module and clear the codes .
was the hybrid battery charge indicator low ,where you having problem with charge on HV battery?
why was the 12 volt battery changed ?
Try this procedure if scanner is not available
yes the blinking part is the alarm but is triggered because of low voltage sensed in system or there is a malfunction
a low battery on a key will cause the alarm to go off ,did you replace the remote battery yet?
Master reset Procedure
1- Disconnect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if cables dont reach
2- Hold cables Together for 60 secs ,then let go
3- Wait 15 minutes
4- Make sure all doors are closed
5- Reconnect battery Cables
6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)
7- Enter the vehicle and attempt to start
Please let me know
ASE Certified Technician