NBD 2006 US SUB

Hey all. New here and just received my 2006 Cinnamon US SUB today. It’s in incredible condition. One little knock near the volume knob just off the control plate. Having a bit of trouble dialing in a low action. I’ll let it settle a bit. If I can’t get it where I like, I’ll get it to my tech. Truss rod is nicely responsive. Just a hair tight. This is my first MM of any flavor so finding my preamp settings is taking a bit. Any advice or pointers about this bass would be appreciated.