I have 3 friends in my portfolio that got LUDs 02, 03JUL07. All 3 have gotten LUDs, also, in 22, 23MAY07. May be some checks requests/results from VSC or iquiries on those days, from lawyers. All, EB3 PD2001/RD2002.
I also had LUD on 7/02 and 7/03, this is first LUD after VSC->TSC. I think it can be due to the status request I made in early June.
Did the message change to "On xyz_date, we responded to your request for more information blah blah blah"?
Or are you just guessing that the LUD change is for the SR response?
From earlier posts in this forum, many members had LUD changes with no message changes during the day, and then found out the next morning that they had gotten approved!
I know for sure that FBI sent response to USCIS for my NC in May. I have a letter from FBI confirming that.
Now I haven't seen any LUD changes on my I485 since end of 2006, though 6/30 I got LUD on my I765 and I131 approved more than a year ago.
So go figure ...
Take infor pass appointment and ask IO if Visa Number is allocated to your case. As per my meeting with IO, Visa Number gets allocated when case is ready for adjustment (i.e. Name check is complete). Most likely once a month. My wife's name check got approved in May and I am sure that in Jun her case was current and must have got Visa number.
case still may go for internal Extended Review. That will also add some delay (sometimes).