Land Rover Repair: rear suspension system, rear suspension system, airline connections

Question
i own a 2000 discovery and live in chicago.  recently, there was a cold snap with the temperatures going to subzero temperatures, at which the rear of my car started to sink.  when i started the engine, it would raise back up.  i was told that i might have a leak in the rear air springs, so i took the car in.  sure enough, there were leaks and i had both rear air springs replaced.  i picked up the car friday (2/9).  the very next morning, the rear of the car had sunk again.  but, when i turn on the engine, it goes back up.  what is going on?  if there are additional problems, shouldn't the dealership have caught it?  am i going to have to pay for more repairs?

Answer
Yes, they should have caught the other leaks, most likely the airline connections are leaking.  You can track down the leaks yourself with some soapy water in a spray bottle, spray it on all the airline connections.  They likely didn't get the connections tight.