How to do Service Request for 140

I filed 140 almost 6 months ago, and its online status is still initial reivew. So, I would like to do a Serevice Request,but have the following questions:

1. Phone number and/or Email address for USCIS? Which way is better?

2. What to say or write? ---Just provide USCIS with my case number and RD? 

3. if it is worth to do PP now?

I would greatly appreciate it if anybody could supply with some information.

 


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