P38A Air suspension collapsed, alternator not working properly

Hi all,

The air suspension dropped completely this morning on this P38 2.5dse auto from 1999. I've been trying all the tricks in the nanocom, but I can't get it to raise back. Compressor is on, according to nanocom. I just accidentally noticed that the battery voltage is 13V at best with the engine running and 12.8V with engine off. This is an issue that needs fixing either way, but can this be related to my problem?

Kind regards,
Matt

To add about the same P38: we have soldered the wires on one of the white connectors (the other one didn't look as corroded). The fault codes before erasing them were:

Front left sensor is out of range
Rear right valve permanently stuck closed
Invalid fault