Most likely a debt collection effort of some kind.  Most likely this group:

Per records of the Secretary of State of California

PAS LEGAL SERVICES, LLC  (possible AKA  NPS)
Entity Number:    201411810415
Date Filed:    04/24/2014
Status:    ACTIVE
Jurisdiction:    CALIFORNIA
Entity Address:    31915 RANCHO CUCAMONGA RD STE 200-290
Entity City, State, Zip:    TEMECULA CA 92591
Agent for Service of Process:    JUSTIN TRIPLETT
Agent Address:    31915 RANCHO CUCAMONGA RD STE 200-290
Agent City, State, Zip:    TEMECULA CA 92591

Another possible zombie incarnation:  Office of Howard Heingels
http://www.bizapedia.com/ca/PAS-LEGAL-SERVICES-LLC.html