Air Shock Troubleshooting and Rough Ride

1998MarkVIII

Registered
Hello All,
I know that this has been asked many times and I have looked at many of the responses, but I am finding it hard to know where to look first.

Symptoms:
Slow to raise the front end. I have taken to waiting for the front to come up before pulling out.
Check air ride message comes on soon after I start driving if I have not waited. It also occasionally comes on after I have been on the highway a while.
Rough ride both at low and high speed.

Based on what I have read:
I need to check the relay by switching it with the ABS relay. Where is the ABS relay located?
I need to check for leaks in the bags. I do not think this is an issue since the system seems to hold air for days.
What else should I do?
 
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