techstream codes need help

P3000, C1259, and C1310 are only there because of the P0A80 and P3017. B1421 is only there because the sun wasn't shining on the sun sensor at the time you read the codes. No big deal.

So you have C1252 and C1256 in the brake system. B1462 from the HVAC, and the aforementioned battery issue.

The B1462 is something with the circuit for the cabin humidity sensor.

C1252 is about the brake pressure pump having to be turned on for too long without achieving the target pressure, and C1256 is about the pressure being too low. You should first pay attention to whether you're hearing the pump run at all. If it is really running, and runs forever without reaching pressure, something's very worn out in this actuator assembly you recently installed. But if you don't hear it running, that could be the whole problem; maybe there's an electrical connection you overlooked. Clearly if the pump can't run when called for, then the call will last an excessively long time and the pressure won't go up.