Meaning of DTC P30001, P30002, P30003, P3006 for 2003 Prius

I am sorry if these have already been explained somewhere but I could not find them. These are the codes I would like to know the meaning of: P30001, P30002, P30003, P3006 That last one only has two zeros. Toyota diagnosed my 2003 Prius after check engine lights came on. They recommend replacing hybrid battery and ECU. But I want to know what those codes mean. Looked all over the internet, found some, but not all of those. Can someone help or direct me to a site that would list them all? Thank you.