USCIS has begun transferring some cases from the Vermont Service Center to the California Service Center in order to balance workloads. Affected cases include Form I-751, the Petition to Remove the Conditions of Residence. If your case is transferred to the California Service Center you will receive a transfer notice. Your original receipt number will not change and the transfer will not delay the processing of your case.
USCIS comments that applicants can check the status of their cases online by entering their receipt number in the Check Status tool online. Additionally, they can sign up to receive automatic case status updates via email.