JV144

Mann-I know you are probably burnt out on answering gx suspension questions, but I have an issue with mine and being in South MS there are no Lexus dealerships within hrs.
A few months ago my wife took her car to a local Toyota dealership to get an oil change. They busted a airbag. Didn't tell us. We went back. They put a land cruiser airbag in. Several months have gone by and bouncy again. And the height control light was not there. The next morning I was taking it to get looked at and the height control was on and worked fine. Drove it all day. That evening ran it through local car wash and filled up with fuel. Started bouncing again. So my questions are:
1. Obviously the car wash is not good for the solenoid and do I need to replace it and can I do it myself?
2. Is this an extension of the Toyota dealerships mishap?

Thanks Jesse