?99 D2 with ACE/SLS and 65K miles. I came out after driving to work to find the rear end on the axle stops. Driving home didn?t change anything. I don?t hear the compressor running and the off road height button just produces a blinking dash light with no raising the rear end. Oddly, last night when I shut the ignition off I did hear the compressor continue to run. It ran for more than 10 minutes before stopping. I don?t know if this event is related or not? I have a shop manual which describes the system well, but has little about troubleshooting other than plugging in Testbook to read any fault codes (nearest dealer is hours away and I probably wouldn?t use them anyway). So far I?ve checked he applicable fuses, they?re fine. A search on this forum produced nothing like what I?m experiencing. Any ideas or suggestions as to where to start troubleshooting?