The Pechanga Bylaws and Constitution provide for OPEN ENROLLMENT each January. If you believe you belong in the tribe, you should request an application.
The address from the Pechanga website for their Tribal Government is:
Pechanga Enrollment Committee
PO BOX 1477
Temecula, CA 92593
fax: (951) 695-1778
Don't take NO for an answer. It's IN their constitution.