According to the N-Number registry, it seems that TriStar History and Preservation company recently bought the ex-Flying Hospital L-1011. The aircraft previously registered P4-MED has now a new tail number N910TE. The airframe, a PSA original, has been stored for several years in Tucson Intl Airport.
Let's hope this move doesn't mean TriStar History and Preservation is giving up on N91011.