I had an issue in February with the SLIP light and VDC OFF light not shutting off. I brought it to the dealer and $800 later, they replaced the brake booster.
Since then the brake pedal has been rock hard after it sits for a couple of hours. I mentioned this the last time I had the oil changed in March and they replaced a check valve which I thought fixed it but it did not fix the issue.
Today, I brought the truck in for an oil change, seat belt recall, and to have them check out the brake system again. This time they determined the brake booster was defective causing a vacuum leak. The good news is this will be covered under a 1 year Nissan parts warranty.
Another correct debug from bestatchess. Thanks best.