What the fork!??!

Over the weekend, I picked up a nicely equipped vintage full suspension bike to take to my in-laws for knocking around during the summer.

Don’t plan on taking it back. It came what appears to be a fairly nice RockShocx fork. I’ve found the rebound adjustment and where to put the air in it does not appear to have a lockout, or a handy chart to tell me how many psi to put in for my bodyweight. 216 pounds by the way.

I can’t determine the model based on the serial number, so I’m trying to figure out how to service it.

Does anyone recognize this model of fork? Any assistance is greatly appreciated