Terminal 30 is most likely just battery running low because of sitting for a long time, probably nothing to do with sagging rear but maybe it disabled compressor to save energy. Charge up battery, delete fault codes and see if any new ones pop up.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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