if retro will be lifted on oct 2007...is this adviseable? tnx for form i-140 premium processing upgrade via form i-907 filings: if you have already filed form i-140, and you wish to request premium processing service, file form i-907 with the service center where form i-140 is pending. if your form i-140 is pending with the nebraska service center or the texas service center, send form i-907 to that center at the previously noted address. if your form i-140 is pending at either the california or vermont service center you may use the corresponding address listed below to file an i-907. california service center mailing address: i-140 premium processing uscis california service center p.o. box 10140 laguna niguel, ca 92607-0140