When I park my 2004 xj8 overnight it either drops all the way down or raises ALL the way up. And I mean all the way up by the next day when I get to work. Air bags and compressor are all under a year old. We have verified that there are zero leaks. I took it to a shop and I got the following errors:


C1830 Air Suspension Compressor Relay - Circuit Failure
C2810 Air suspension vent solenoid - circuit failure
C2303 Leveling plausibility error
C1430 Rear left damper- short circuit to battery
C1427 Rear right damper- circuit open


They said I would need to start by replacing the vent solenoid and quoted me $537 for the part $281 for labor. Is he leading me down the correct path?