You would put LIN2290065000 in CaseTrack. I ran it for LIN2290065000 - LIN2290065499 and see that one case was approved on January 11th.
To find the range your service center is working on, search in increments od 500, e.g. LIN2290064500, LIN2290064000, LIN2290063500 etc until you find a range where a lot of I-751s have decisions, approvals, RFEs or denials around today or a week earlier.